docs: update link to schematics schema (#41258)
docs: update link to schematics schema (#41258)

PREVIOUSLY:
The https://angular.io/guide/schematics#configuring-cli-schematics page has a link to "app" schematic specifically and to a version 7.

NOW:
The https://angular.io/guide/schematics#configuring-cli-schematics page links to the latest version of schematics (all of them, not just the "app" schematic) to let the reader snoop around a bit.
PR Close #41258

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