(docs): removing `addProvider` from `UpgradeAdapter` (#11934)
(docs): removing `addProvider` from `UpgradeAdapter` (#11934)

The `addProvider` function in the `UpgradeAdapter` was deprecated in this [commit](https://github.com/angular/angular/commit/d21331e902341abe3fdec267d0acae223c801c52#diff-77163e956a7842149f583846c1c01651) and has been removed in final. Given this, the documentation for downgrading ng2 providers for use in ng1 is invalid.
petebacondarwin/angular,cironunes/angular,ValtoFrameworks/Angular-2,vikerman/angular,tbosch/angular,angular-indonesia/angular,mgechev/angular,chalin/angular,SaltyDH/angular,xcaliber-tech/angular,chajath/angular,robwormald/angular,souvikbasu/angular,vamsivarikuti/angular,vsavkin/angular,IgorMinar/angular,alexeagle/angular,mgechev/angular,royling/angular,JiaLiPassion/angular,mzgol/angular,angular-indonesia/angular,sarunint/angular,xcaliber-tech/angular,ValtoFrameworks/Angular-2,pk-karthik/framework-js-angular,not-for-me/angular,hansl/angular,IgorMinar/angular,laskoviymishka/angular,Brocco/angular,vicb/angular,kegluneq/angular,angular/angular,petebacondarwin/angular,juristr/angular,Mathou54/angular,shairez/angular,Toxicable/angular,LucasSloan/angular,gdi2290/angular,rjamet/angular,LucasSloan/angular,IdeaBlade/angular,sarunint/angular,cexbrayat/angular,manekinekko/angular,mdegoo/angular,manekinekko/angular,kylecordes/angular,Brocco/angular,mgiambalvo/angular,diestrin/angular,mhevery/angular,laskoviymishka/angular,IdeaBlade/angular,ghetolay/angular,SaltyDH/angular,chajath/angular,ultrasonicsoft/angular,heathkit/angular,dejour/angular,rjamet/angular,meeroslav/angular,cironunes/angular,sarunint/angular,ocombe/angular,ocombe/angular,petebacondarwin/angular,dtoroshin/n2oDoc,angular-indonesia/angular,jasonaden/angular,aboveyou00/angular,gnomeontherun/angular,ollie314/angular,awerlang/angular,jesperronn/angular,kylecordes/angular,dsebastien/angular,dsebastien/angular,gkalpak/angular,itamark/angular,dtoroshin/n2oDoc,wKoza/angular,pk-karthik/framework-js-angular,cassand/angular,kylecordes/angular,manekinekko/angular,jonrimmer/angular,awerlang/angular,angularbrasil/angular,StephenFluin/angular,chuckjaz/angular,sarunint/angular,vandres/angular,jasonaden/angular,dtoroshin/n2oDoc,LucasSloan/angular,filipesilva/angular,AlmogShaul/angular,xcaliber-tech/angular,laskoviymishka/angular,cassand/angular,StephenFluin/angular,StephenFluin/angular,ultrasonicsoft/angular,mzgol/angular,NathanWalker/angular,vicb/angular,gjungb/angular,itamark/angular,alexeagle/angular,ValtoFrameworks/Angular-2,domusofsail/angular,wKoza/angular,mlaval/angular,trshafer/angular,ghetolay/angular,mikeybyker/angular,jasonaden/angular,gkalpak/angular,mgechev/angular,alxhub/angular,awerlang/angular,shairez/angular,heathkit/angular,kegluneq/angular,mgol/angular,tbosch/angular,chalin/angular,ollie314/angular,sjtrimble/angular,rkirov/angular,IgorMinar/angular,mgiambalvo/angular,NathanWalker/angular,AlmogShaul/angular,graveto/angular,mgiambalvo/angular,angular/angular,cassand/angular,mdegoo/angular,wKoza/angular,petebacondarwin/angular,gdi2290/angular,wKoza/angular,jonrimmer/angular,cironunes/angular,sjtrimble/angular,hansl/angular,heathkit/angular,robwormald/angular,mgiambalvo/angular,tbosch/angular,laskoviymishka/angular,vamsivarikuti/angular,dsebastien/angular,mhevery/angular,e-hein/angular,ollie314/angular,dejour/angular,tolemac/angular,graveto/angular,cironunes/angular,JSMike/angular,chajath/angular,mprobst/angular,gdi2290/angular,StephenFluin/angular,mzgol/angular,snaptech/angular,JiaLiPassion/angular,petebacondarwin/angular,robwormald/angular,pkozlowski-opensource/angular,NathanWalker/angular,matsko/angular,cexbrayat/angular,shairez/angular,hansl/angular,vamsivarikuti/angular,pk-karthik/framework-js-angular,diestrin/angular,souvikbasu/angular,JiaLiPassion/angular,vandres/angular,vikerman/angular,Mathou54/angular,alxhub/angular,rkirov/angular,cexbrayat/angular,aboveyou00/angular,pk-karthik/framework-js-angular,pk-karthik/framework-js-angular,mlaval/angular,chrisse27/angular,ValtoFrameworks/Angular-2,nosovk/angular,alxhub/angular,kegluneq/angular,laskoviymishka/angular,kegluneq/angular,mdegoo/angular,awerlang/angular,mgechev/angular,e-hein/angular,gnomeontherun/angular,IdeaBlade/angular,jonrimmer/angular,vicb/angular,chrisse27/angular,SaltyDH/angular,vsavkin/angular,dejour/angular,ollie314/angular,AlmogShaul/angular,vinagreti/angular,jesperronn/angular,royling/angular,royling/angular,chajath/angular,mzgol/angular,juristr/angular,gnomeontherun/angular,asnowwolf/angular,NathanWalker/angular,kwalrath/angular,dsebastien/angular,filipesilva/angular,Toxicable/angular,robwormald/angular,vandres/angular,not-for-me/angular,vinagreti/angular,pkozlowski-opensource/angular,mhevery/angular,tolemac/angular,snaptech/angular,e-hein/angular,blesh/angular,snaptech/angular,trshafer/angular,kegluneq/angular,gjungb/angular,jesperronn/angular,cassand/angular,angular/angular,chalin/angular,matsko/angular,vikerman/angular,cironunes/angular,mprobst/angular,juristr/angular,vicb/angular,cexbrayat/angular,Mathou54/angular,graveto/angular,panuruj/angular,hansl/angular,snaptech/angular,brandonroberts/angular,rjamet/angular,dejour/angular,dejour/angular,not-for-me/angular,angularbrasil/angular,gdi2290/angular,alexeagle/angular,meeroslav/angular,kwalrath/angular,chuckjaz/angular,royling/angular,pkozlowski-opensource/angular,domusofsail/angular,chuckjaz/angular,juristr/angular,ollie314/angular,vamsivarikuti/angular,cexbrayat/angular,LucasSloan/angular,cironunes/angular,Toxicable/angular,diestrin/angular,not-for-me/angular,vandres/angular,SaltyDH/angular,itamark/angular,angularbrasil/angular,aboveyou00/angular,smartm0use/angular,vinagreti/angular,mhevery/angular,alxhub/angular,jasonaden/angular,meeroslav/angular,juleskremer/angular,ghetolay/angular,nosovk/angular,graveto/angular,Brocco/angular,tbosch/angular,hansl/angular,petebacondarwin/angular,blesh/angular,mgol/angular,souvikbasu/angular,sjtrimble/angular,trshafer/angular,asnowwolf/angular,nosovk/angular,Toxicable/angular,e-hein/angular,panuruj/angular,mhevery/angular,blesh/angular,ultrasonicsoft/angular,robwormald/angular,brandonroberts/angular,asnowwolf/angular,gnomeontherun/angular,jonrimmer/angular,brandonroberts/angular,JSMike/angular,chajath/angular,mgol/angular,asnowwolf/angular,gdi2290/angular,vsavkin/angular,chuckjaz/angular,StephenFluin/angular,IgorMinar/angular,alxhub/angular,e-hein/angular,juleskremer/angular,juristr/angular,ocombe/angular,pkozlowski-opensource/angular,domusofsail/angular,vikerman/angular,angularbrasil/angular,kylecordes/angular,JSMike/angular,dsebastien/angular,rkirov/angular,ghetolay/angular,chrisse27/angular,meeroslav/angular,sarunint/angular,vsavkin/angular,filipesilva/angular,trshafer/angular,shairez/angular,chuckjaz/angular,domusofsail/angular,mgiambalvo/angular,graveto/angular,mdegoo/angular,mprobst/angular,vamsivarikuti/angular,juleskremer/angular,vinagreti/angular,graveto/angular,mgol/angular,IdeaBlade/angular,brandonroberts/angular,Brocco/angular,mikeybyker/angular,kylecordes/angular,mzgol/angular,souvikbasu/angular,juleskremer/angular,Brocco/angular,Brocco/angular,mprobst/angular,manekinekko/angular,vinagreti/angular,alexeagle/angular,rkirov/angular,IdeaBlade/angular,gkalpak/angular,mlaval/angular,tbosch/angular,mprobst/angular,kegluneq/angular,itamark/angular,AlmogShaul/angular,cassand/angular,mzgol/angular,chrisse27/angular,robwormald/angular,hansl/angular,kwalrath/angular,alexeagle/angular,aboveyou00/angular,royling/angular,NathanWalker/angular,angular/angular,blesh/angular,vikerman/angular,tolemac/angular,diestrin/angular,tolemac/angular,ValtoFrameworks/Angular-2,panuruj/angular,vikerman/angular,filipesilva/angular,rkirov/angular,meeroslav/angular,JiaLiPassion/angular,dsebastien/angular,kwalrath/angular,chrisse27/angular,shairez/angular,domusofsail/angular,ultrasonicsoft/angular,Toxicable/angular,aboveyou00/angular,ocombe/angular,tolemac/angular,mdegoo/angular,vicb/angular,NathanWalker/angular,smartm0use/angular,cassand/angular,jasonaden/angular,kwalrath/angular,not-for-me/angular,AlmogShaul/angular,angular-indonesia/angular,kylecordes/angular,kara/angular,gjungb/angular,brandonroberts/angular,kara/angular,matsko/angular,angularbrasil/angular,LucasSloan/angular,mikeybyker/angular,mikeybyker/angular,kara/angular,mlaval/angular,gdi2290/angular,wKoza/angular,tolemac/angular,mgol/angular,heathkit/angular,blesh/angular,snaptech/angular,filipesilva/angular,mhevery/angular,SaltyDH/angular,dtoroshin/n2oDoc,LucasSloan/angular,ghetolay/angular,awerlang/angular,gkalpak/angular,mdegoo/angular,sarunint/angular,IgorMinar/angular,mgechev/angular,vicb/angular,matsko/angular,juristr/angular,souvikbasu/angular,kara/angular,smartm0use/angular,ultrasonicsoft/angular,jonrimmer/angular,manekinekko/angular,jesperronn/angular,rjamet/angular,jesperronn/angular,xcaliber-tech/angular,wKoza/angular,jasonaden/angular,trshafer/angular,smartm0use/angular,sjtrimble/angular,Mathou54/angular,IgorMinar/angular,mikeybyker/angular,brandonroberts/angular,heathkit/angular,chalin/angular,JSMike/angular,mgol/angular,itamark/angular,smartm0use/angular,sjtrimble/angular,kara/angular,panuruj/angular,vandres/angular,aboveyou00/angular,matsko/angular,chuckjaz/angular,panuruj/angular,heathkit/angular,JSMike/angular,snaptech/angular,manekinekko/angular,ocombe/angular,mlaval/angular,dtoroshin/n2oDoc,ocombe/angular,gjungb/angular,Toxicable/angular,nosovk/angular,asnowwolf/angular,trshafer/angular,jonrimmer/angular,kara/angular,alexeagle/angular,vsavkin/angular,rkirov/angular,juleskremer/angular,mprobst/angular,nosovk/angular,angularbrasil/angular,gjungb/angular,xcaliber-tech/angular,Mathou54/angular,pkozlowski-opensource/angular,ultrasonicsoft/angular