docs(forms): add value to formControl for better demonstration of requiredTrue validator (#45533)
docs(forms): add value to formControl for better demonstration of requiredTrue validator (#45533)

in the validators documentation, the value for the formControl for both required and requiredTrue validators is an empty string. This is OK for required since it gives us an error. But I think if we set the value of formControl responsible for requiredTrue to something other than an empty string (e.g.: 'some value'), it would demonstrate the difference between required and requiredTrue better.

PR Close #45533

angular-indonesia/angular,angular/angular,angular/angular,angular/angular,gkalpak/angular,gnomeontherun/angular,angular/angular,JiaLiPassion/angular,gkalpak/angular,gkalpak/angular,JiaLiPassion/angular,gkalpak/angular,angular-indonesia/angular,JiaLiPassion/angular,gnomeontherun/angular,angular-indonesia/angular,angular-indonesia/angular,JiaLiPassion/angular,gnomeontherun/angular,gnomeontherun/angular