docs: clarify usage of using /deep/ in component styles guide (#30452)
docs: clarify usage of using /deep/ in component styles guide (#30452)

Updated the description regarding the (deprecated) /deep/ pseudo-selector to clarify its propensity to bleed styles across components and its solution

closes #29967

PR Close #30452

manekinekko/angular,vikerman/angular,angular/angular,Toxicable/angular,gdi2290/angular,gnomeontherun/angular,blesh/angular,Toxicable/angular,matsko/angular,alxhub/angular,Toxicable/angular,matsko/angular,snaptech/angular,matsko/angular,brandonroberts/angular,sarunint/angular,mgechev/angular,shairez/angular,mhevery/angular,shairez/angular,alexeagle/angular,Toxicable/angular,petebacondarwin/angular,Toxicable/angular,petebacondarwin/angular,wKoza/angular,mhevery/angular,matsko/angular,angular/angular,filipesilva/angular,petebacondarwin/angular,Toxicable/angular,sarunint/angular,IdeaBlade/angular,gkalpak/angular,angular-indonesia/angular,alxhub/angular,sarunint/angular,Brocco/angular,gkalpak/angular,IdeaBlade/angular,jasonaden/angular,snaptech/angular,gnomeontherun/angular,JiaLiPassion/angular,Brocco/angular,manekinekko/angular,mprobst/angular,jasonaden/angular,vikerman/angular,angular/angular,gdi2290/angular,JiaLiPassion/angular,petebacondarwin/angular,mprobst/angular,sarunint/angular,filipesilva/angular,vikerman/angular,sarunint/angular,gnomeontherun/angular,blesh/angular,wKoza/angular,snaptech/angular,petebacondarwin/angular,vikerman/angular,ocombe/angular,filipesilva/angular,brandonroberts/angular,manekinekko/angular,brandonroberts/angular,alxhub/angular,wKoza/angular,vikerman/angular,IdeaBlade/angular,manekinekko/angular,angular-indonesia/angular,mprobst/angular,snaptech/angular,filipesilva/angular,gdi2290/angular,wKoza/angular,Brocco/angular,StephenFluin/angular,filipesilva/angular,angular-indonesia/angular,alexeagle/angular,angular/angular,JiaLiPassion/angular,StephenFluin/angular,jasonaden/angular,StephenFluin/angular,IdeaBlade/angular,IdeaBlade/angular,sarunint/angular,wKoza/angular,JiaLiPassion/angular,gdi2290/angular,wKoza/angular,gdi2290/angular,snaptech/angular,vikerman/angular,matsko/angular,ocombe/angular,StephenFluin/angular,Brocco/angular,gkalpak/angular,mhevery/angular,mgechev/angular,brandonroberts/angular,Brocco/angular,gdi2290/angular,brandonroberts/angular,shairez/angular,mprobst/angular,petebacondarwin/angular,ocombe/angular,blesh/angular,mprobst/angular,gkalpak/angular,mgechev/angular,jasonaden/angular,ocombe/angular,shairez/angular,alexeagle/angular,gnomeontherun/angular,jasonaden/angular,mhevery/angular,brandonroberts/angular,alxhub/angular,Brocco/angular,jasonaden/angular,StephenFluin/angular,mhevery/angular,blesh/angular,snaptech/angular,alxhub/angular,alexeagle/angular,angular-indonesia/angular,alexeagle/angular,mprobst/angular,mhevery/angular,shairez/angular,ocombe/angular,alexeagle/angular,ocombe/angular,manekinekko/angular,blesh/angular,mgechev/angular,manekinekko/angular,mgechev/angular