docs: add doc for complex config values (#31010)
docs: add doc for complex config values (#31010)

PR Close #31010

mgechev/angular,vikerman/angular,snaptech/angular,vikerman/angular,gkalpak/angular,Brocco/angular,vikerman/angular,blesh/angular,shairez/angular,brandonroberts/angular,brandonroberts/angular,shairez/angular,JiaLiPassion/angular,mprobst/angular,gdi2290/angular,mgechev/angular,gdi2290/angular,ocombe/angular,mprobst/angular,filipesilva/angular,alxhub/angular,JiaLiPassion/angular,vikerman/angular,matsko/angular,matsko/angular,filipesilva/angular,ocombe/angular,mhevery/angular,angular-indonesia/angular,sarunint/angular,brandonroberts/angular,brandonroberts/angular,matsko/angular,alxhub/angular,snaptech/angular,manekinekko/angular,sarunint/angular,wKoza/angular,sarunint/angular,Brocco/angular,gdi2290/angular,blesh/angular,vikerman/angular,gdi2290/angular,gnomeontherun/angular,brandonroberts/angular,manekinekko/angular,manekinekko/angular,angular-indonesia/angular,blesh/angular,shairez/angular,snaptech/angular,gnomeontherun/angular,filipesilva/angular,Toxicable/angular,manekinekko/angular,mprobst/angular,angular/angular,matsko/angular,angular/angular,ocombe/angular,ocombe/angular,Toxicable/angular,angular-indonesia/angular,angular-indonesia/angular,IdeaBlade/angular,snaptech/angular,ocombe/angular,wKoza/angular,matsko/angular,sarunint/angular,Toxicable/angular,shairez/angular,gnomeontherun/angular,mhevery/angular,manekinekko/angular,mhevery/angular,blesh/angular,StephenFluin/angular,angular/angular,Brocco/angular,gkalpak/angular,manekinekko/angular,shairez/angular,mgechev/angular,wKoza/angular,Toxicable/angular,alexeagle/angular,gkalpak/angular,mhevery/angular,sarunint/angular,alexeagle/angular,StephenFluin/angular,mprobst/angular,alexeagle/angular,mgechev/angular,alxhub/angular,alxhub/angular,gdi2290/angular,vikerman/angular,Brocco/angular,filipesilva/angular,gdi2290/angular,wKoza/angular,alexeagle/angular,IdeaBlade/angular,Toxicable/angular,IdeaBlade/angular,ocombe/angular,snaptech/angular,mgechev/angular,gnomeontherun/angular,JiaLiPassion/angular,Brocco/angular,wKoza/angular,IdeaBlade/angular,blesh/angular,mhevery/angular,mhevery/angular,filipesilva/angular,mprobst/angular,StephenFluin/angular,alexeagle/angular,sarunint/angular,StephenFluin/angular,StephenFluin/angular,Toxicable/angular,brandonroberts/angular,Brocco/angular,alexeagle/angular,mprobst/angular,wKoza/angular,IdeaBlade/angular,snaptech/angular,alxhub/angular,JiaLiPassion/angular,angular/angular,gkalpak/angular