docs: change heading to a sub-heading (#39131)
docs: change heading to a sub-heading (#39131)

This commit changes the heading of the section
`Use TypeScript path mapping for peer dependencies` to a sub-heading of
`Linked Libraries`.

Fixes #39130

PR Close #39131

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