docs: fix confusing description for strictTemplates (#39745)
docs: fix confusing description for strictTemplates (#39745)

This commit fixes a confusing description of the `strictTemplates` flag.

> When `true`, enables strict template type checking in Angular version 9.

This seems to imply that the flag is only available in one version.
Strict template type checking is available in version 9 **and above**.

PR Close #39745

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