docs: move hierarchical injectors to reference section (#39383)
docs: move hierarchical injectors to reference section (#39383)

PR Close #39383

alxhub/angular,gnomeontherun/angular,blesh/angular,gkalpak/angular,manekinekko/angular,IdeaBlade/angular,manekinekko/angular,gnomeontherun/angular,IdeaBlade/angular,angular/angular,angular/angular,mgechev/angular,mgechev/angular,angular-indonesia/angular,gkalpak/angular,alxhub/angular,IdeaBlade/angular,JiaLiPassion/angular,brandonroberts/angular,blesh/angular,ocombe/angular,angular/angular,gkalpak/angular,JiaLiPassion/angular,angular-indonesia/angular,brandonroberts/angular,angular-indonesia/angular,manekinekko/angular,manekinekko/angular,JiaLiPassion/angular,blesh/angular,brandonroberts/angular,manekinekko/angular,angular-indonesia/angular,blesh/angular,shairez/angular,mgechev/angular,alxhub/angular,mgechev/angular,alxhub/angular,angular/angular,shairez/angular,shairez/angular,ocombe/angular,ocombe/angular,IdeaBlade/angular,gkalpak/angular,brandonroberts/angular,ocombe/angular,ocombe/angular,gnomeontherun/angular,blesh/angular,ocombe/angular,brandonroberts/angular,JiaLiPassion/angular,mgechev/angular,alxhub/angular,brandonroberts/angular,shairez/angular,manekinekko/angular,shairez/angular,gnomeontherun/angular,IdeaBlade/angular