docs(ContentChild): add example with refs
docs(ContentChild): add example with refs

Add missing example on how ContentChild works with refs
Closes #7160
Closes #7162
chuckjaz/angular,alxhub/angular,ocombe/angular,mhevery/angular,mzgol/angular,brandonroberts/angular,kegluneq/angular,mgiambalvo/angular,tycho01/angular,hansl/angular,cironunes/angular,vinagreti/angular,cassand/angular,alfonso-presa/angular,UIUXEngineering/angular,gkalpak/angular,manekinekko/angular,jonrimmer/angular,gionkunz/angular,rkirov/angular,meeroslav/angular,shairez/angular,nosovk/angular,robwormald/angular,ocombe/angular,NathanWalker/angular,naomiblack/angular,vamsivarikuti/angular,ollie314/angular,rkirov/angular,petebacondarwin/angular,chajath/angular,cironunes/angular,trshafer/angular,vsavkin/angular,mgechev/angular,robwormald/angular,kylecordes/angular,chrisse27/angular,NathanWalker/angular,domusofsail/angular,cassand/angular,pkozlowski-opensource/angular,mlaval/angular,angularbrasil/angular,ScottSWu/angular,alexeagle/angular,templth/angular,aboveyou00/angular,mhevery/angular,kegluneq/angular,itamark/angular,awerlang/angular,alexeagle/angular,diestrin/angular,UIUXEngineering-Forks/angular,vinagreti/angular,hterkelsen/angular,domusofsail/angular,rjamet/angular,Flounn/angular,IgorMinar/angular,mgol/angular,e-hein/angular,tolemac/angular,IgorMinar/angular,angularbrasil/angular,graveto/angular,matsko/angular,juleskremer/angular,matsko/angular,awerlang/angular,manekinekko/angular,wKoza/angular,vicb/angular,aboveyou00/angular,UIUXEngineering/angular,kegluneq/angular,JiaLiPassion/angular,juristr/angular,jasonaden/angular,tbosch/angular,templth/angular,ultrasonicsoft/angular,JanStureNielsen/angular,JiaLiPassion/angular,alxhub/angular,alfonso-presa/angular,royling/angular,itamark/angular,dydek/angular,matsko/angular,manekinekko/angular,SaltyDH/angular,cassand/angular,StephenFluin/angular,pkozlowski-opensource/angular,gjungb/angular,awerlang/angular,vikerman/angular,vandres/angular,petebacondarwin/angular,royling/angular,meeroslav/angular,nosovk/angular,rbevers/angular,LucasSloan/angular,panuruj/angular,Brocco/angular,vikerman/angular,zhura/angular,souvikbasu/angular,mgol/angular,domusofsail/angular,JSMike/angular,gkalpak/angular,angular-indonesia/angular,hterkelsen/angular,petebacondarwin/angular,shairez/angular,IgorMinar/angular,pkozlowski-opensource/angular,JanStureNielsen/angular,IgorMinar/angular,brandonroberts/angular,ollie314/angular,hterkelsen/angular,snaptech/angular,laskoviymishka/angular,IdeaBlade/angular,SaltyDH/angular,gionkunz/angular,dsebastien/angular,zhura/angular,UIUXEngineering-Forks/angular,gdi2290/angular,snaptech/angular,JSMike/angular,mgechev/angular,vamsivarikuti/angular,e-hein/angular,filipesilva/angular,rkirov/angular,jesperronn/angular,mlaval/angular,cassand/angular,robwormald/angular,IgorMinar/angular,hansl/angular,mikeybyker/angular,diestrin/angular,LucasSloan/angular,naomiblack/angular,shairez/angular,jesperronn/angular,trshafer/angular,ocombe/angular,jesperronn/angular,not-for-me/angular,mdegoo/angular,hannahhoward/angular,brandonroberts/angular,Toxicable/angular,brandonroberts/angular,jasonaden/angular,vikerman/angular,jonrimmer/angular,angular-indonesia/angular,angularbrasil/angular,diestrin/angular,dsebastien/angular,ultrasonicsoft/angular,AlmogShaul/angular,angular-indonesia/angular,SekibOmazic/angular,kwalrath/angular,tolemac/angular,dtoroshin/n2oDoc,rbevers/angular,gdi2290/angular,cironunes/angular,kara/angular,templth/angular,heathkit/angular,jonrimmer/angular,hansl/angular,blesh/angular,jasonaden/angular,gnomeontherun/angular,shairez/angular,xcaliber-tech/angular,mgechev/angular,alexeagle/angular,filipesilva/angular,mikeybyker/angular,wKoza/angular,cexbrayat/angular,domusofsail/angular,mzgol/angular,naomiblack/angular,hterkelsen/angular,alfonso-presa/angular,IdeaBlade/angular,gionkunz/angular,SekibOmazic/angular,brandonroberts/angular,ocombe/angular,jonrimmer/angular,trshafer/angular,juristr/angular,pkozlowski-opensource/angular,snaptech/angular,zhura/angular,chalin/angular,vicb/angular,awerlang/angular,NathanWalker/angular,smartm0use/angular,JSMike/angular,mikeybyker/angular,dydek/angular,laco0416/angular,cironunes/angular,zhura/angular,vsavkin/angular,dydek/angular,ultrasonicsoft/angular,mdegoo/angular,sjtrimble/angular,meeroslav/angular,dsebastien/angular,rbevers/angular,LucasSloan/angular,UIUXEngineering-Forks/angular,royling/angular,rbevers/angular,mgol/angular,StephenFluin/angular,youdz/angular,gdi2290/angular,juleskremer/angular,mgol/angular,juristr/angular,sarunint/angular,Flounn/angular,kwalrath/angular,itamark/angular,mdegoo/angular,Brocco/angular,dejour/angular,aboveyou00/angular,chajath/angular,templth/angular,tycho01/angular,petebacondarwin/angular,souvikbasu/angular,JanStureNielsen/angular,gjungb/angular,Mathou54/angular,angular/angular,wKoza/angular,trshafer/angular,ghetolay/angular,alamgird/angular,rjamet/angular,mgiambalvo/angular,Flounn/angular,snaptech/angular,gjungb/angular,alfonso-presa/angular,angularbrasil/angular,vinagreti/angular,blesh/angular,SaltyDH/angular,StephenFluin/angular,tolemac/angular,Flounn/angular,NathanWalker/angular,rkirov/angular,juleskremer/angular,rkirov/angular,LucasSloan/angular,not-for-me/angular,ScottSWu/angular,hansl/angular,graveto/angular,dsebastien/angular,kylecordes/angular,dejour/angular,youdz/angular,chalin/angular,mzgol/angular,chuckjaz/angular,cironunes/angular,StephenFluin/angular,UIUXEngineering/angular,cironunes/angular,ghetolay/angular,tbosch/angular,Flounn/angular,juristr/angular,AlmogShaul/angular,Toxicable/angular,angular/angular,jonrimmer/angular,ValtoFrameworks/Angular-2,laskoviymishka/angular,cexbrayat/angular,angularbrasil/angular,snaptech/angular,dsebastien/angular,Brocco/angular,e-hein/angular,tolemac/angular,heathkit/angular,angular/angular,mgol/angular,dtoroshin/n2oDoc,dtoroshin/n2oDoc,pk-karthik/framework-js-angular,ScottSWu/angular,SekibOmazic/angular,ollie314/angular,Brocco/angular,hansl/angular,gkalpak/angular,nosovk/angular,chuckjaz/angular,kara/angular,chrisse27/angular,vandres/angular,LucasSloan/angular,tolemac/angular,alexeagle/angular,mgiambalvo/angular,Mathou54/angular,chalin/angular,not-for-me/angular,kylecordes/angular,chajath/angular,Toxicable/angular,IdeaBlade/angular,kylecordes/angular,mzgol/angular,Brocco/angular,sjtrimble/angular,graveto/angular,laskoviymishka/angular,StephenFluin/angular,ValtoFrameworks/Angular-2,mhevery/angular,xcaliber-tech/angular,mdegoo/angular,panuruj/angular,asnowwolf/angular,mprobst/angular,heathkit/angular,blesh/angular,pkozlowski-opensource/angular,alxhub/angular,SekibOmazic/angular,alamgird/angular,jonrimmer/angular,not-for-me/angular,petebacondarwin/angular,cexbrayat/angular,kegluneq/angular,matsko/angular,gdi2290/angular,juristr/angular,alxhub/angular,mprobst/angular,vsavkin/angular,asnowwolf/angular,nosovk/angular,alexeagle/angular,jasonaden/angular,alamgird/angular,IdeaBlade/angular,rbevers/angular,NathanWalker/angular,templth/angular,zhura/angular,laskoviymishka/angular,ghetolay/angular,laco0416/angular,mprobst/angular,graveto/angular,diestrin/angular,smartm0use/angular,meeroslav/angular,heathkit/angular,vandres/angular,panuruj/angular,hannahhoward/angular,tycho01/angular,robwormald/angular,hterkelsen/angular,mlaval/angular,ghetolay/angular,mzgol/angular,domusofsail/angular,awerlang/angular,vicb/angular,souvikbasu/angular,Toxicable/angular,kylecordes/angular,Brocco/angular,hannahhoward/angular,gnomeontherun/angular,gjungb/angular,ScottSWu/angular,vandres/angular,pk-karthik/framework-js-angular,mgechev/angular,wKoza/angular,Mathou54/angular,asnowwolf/angular,JanStureNielsen/angular,JSMike/angular,vamsivarikuti/angular,dydek/angular,laco0416/angular,IdeaBlade/angular,juleskremer/angular,SekibOmazic/angular,gionkunz/angular,chrisse27/angular,hannahhoward/angular,tbosch/angular,ollie314/angular,snaptech/angular,hannahhoward/angular,alfonso-presa/angular,Mathou54/angular,alamgird/angular,vinagreti/angular,hansl/angular,mzgol/angular,vikerman/angular,mdegoo/angular,sjtrimble/angular,vsavkin/angular,jesperronn/angular,JSMike/angular,juristr/angular,cassand/angular,UIUXEngineering-Forks/angular,angularbrasil/angular,filipesilva/angular,kegluneq/angular,mprobst/angular,youdz/angular,sarunint/angular,vicb/angular,trshafer/angular,asnowwolf/angular,mdegoo/angular,JiaLiPassion/angular,alexeagle/angular,rbevers/angular,manekinekko/angular,kegluneq/angular,filipesilva/angular,souvikbasu/angular,chrisse27/angular,chalin/angular,mprobst/angular,graveto/angular,pk-karthik/framework-js-angular,chrisse27/angular,ValtoFrameworks/Angular-2,kylecordes/angular,vamsivarikuti/angular,manekinekko/angular,ultrasonicsoft/angular,SekibOmazic/angular,sarunint/angular,Mathou54/angular,wKoza/angular,gionkunz/angular,vikerman/angular,mgechev/angular,rjamet/angular,tycho01/angular,dsebastien/angular,kara/angular,ultrasonicsoft/angular,dtoroshin/n2oDoc,alxhub/angular,ValtoFrameworks/Angular-2,rkirov/angular,tbosch/angular,gdi2290/angular,angular/angular,sjtrimble/angular,blesh/angular,gdi2290/angular,heathkit/angular,kara/angular,dtoroshin/n2oDoc,dejour/angular,laco0416/angular,mikeybyker/angular,UIUXEngineering-Forks/angular,jasonaden/angular,UIUXEngineering/angular,Toxicable/angular,UIUXEngineering-Forks/angular,juleskremer/angular,gionkunz/angular,laco0416/angular,sarunint/angular,mhevery/angular,kwalrath/angular,AlmogShaul/angular,gkalpak/angular,asnowwolf/angular,itamark/angular,manekinekko/angular,hterkelsen/angular,alfonso-presa/angular,chajath/angular,tycho01/angular,UIUXEngineering/angular,vicb/angular,SaltyDH/angular,ghetolay/angular,chuckjaz/angular,tbosch/angular,mhevery/angular,cexbrayat/angular,rjamet/angular,graveto/angular,mhevery/angular,dejour/angular,ScottSWu/angular,SaltyDH/angular,vsavkin/angular,zhura/angular,matsko/angular,royling/angular,laco0416/angular,vamsivarikuti/angular,dydek/angular,kwalrath/angular,e-hein/angular,ultrasonicsoft/angular,ocombe/angular,youdz/angular,xcaliber-tech/angular,angular-indonesia/angular,blesh/angular,jasonaden/angular,ocombe/angular,wKoza/angular,pk-karthik/framework-js-angular,smartm0use/angular,kwalrath/angular,naomiblack/angular,youdz/angular,hannahhoward/angular,vikerman/angular,vicb/angular,robwormald/angular,chajath/angular,LucasSloan/angular,tolemac/angular,panuruj/angular,trshafer/angular,aboveyou00/angular,mgiambalvo/angular,shairez/angular,gjungb/angular,e-hein/angular,kara/angular,dejour/angular,vandres/angular,JanStureNielsen/angular,ScottSWu/angular,sarunint/angular,ollie314/angular,nosovk/angular,mikeybyker/angular,cexbrayat/angular,mlaval/angular,mlaval/angular,smartm0use/angular,panuruj/angular,meeroslav/angular,robwormald/angular,youdz/angular,Toxicable/angular,petebacondarwin/angular,chuckjaz/angular,brandonroberts/angular,alamgird/angular,jesperronn/angular,NathanWalker/angular,laskoviymishka/angular,heathkit/angular,royling/angular,souvikbasu/angular,pk-karthik/framework-js-angular,mprobst/angular,smartm0use/angular,xcaliber-tech/angular,AlmogShaul/angular,kara/angular,vinagreti/angular,mgiambalvo/angular,xcaliber-tech/angular,tycho01/angular,AlmogShaul/angular,IgorMinar/angular,gnomeontherun/angular,aboveyou00/angular,cassand/angular,sarunint/angular,chuckjaz/angular,not-for-me/angular,ValtoFrameworks/Angular-2,aboveyou00/angular,sjtrimble/angular,mgol/angular,JiaLiPassion/angular,filipesilva/angular,naomiblack/angular,itamark/angular,gnomeontherun/angular