docs: fix incorrect header on custom event docs (#29784)
docs: fix incorrect header on custom event docs (#29784)

PR Close #29784

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