docs: documentation of descendants property of @ContentChildren (#35927)
docs: documentation of descendants property of @ContentChildren (#35927)

documentation of decendants property of @ContentChildren was not clear when decendants was set to false it did not pick up direct children when any directive was used on the elements. With Ivy the functionality follows the following pattern only query direct children (in the sense of elements in a template) when descendants: false is specified.

Fixes #20074

PR Close #35927

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