docs: update release.md and rename 'beta' releases to 'next' (#35276)
docs: update release.md and rename 'beta' releases to 'next' (#35276)

also clarify what 'next' releases are.

PR Close #35276

Toxicable/angular,JiaLiPassion/angular,snaptech/angular,IdeaBlade/angular,StephenFluin/angular,blesh/angular,gkalpak/angular,JiaLiPassion/angular,gdi2290/angular,gdi2290/angular,angular/angular,mgechev/angular,gkalpak/angular,wKoza/angular,alxhub/angular,angular/angular,Toxicable/angular,shairez/angular,ocombe/angular,wKoza/angular,Toxicable/angular,StephenFluin/angular,filipesilva/angular,manekinekko/angular,filipesilva/angular,StephenFluin/angular,manekinekko/angular,gnomeontherun/angular,matsko/angular,blesh/angular,wKoza/angular,filipesilva/angular,snaptech/angular,blesh/angular,Toxicable/angular,angular/angular,brandonroberts/angular,angular-indonesia/angular,snaptech/angular,Toxicable/angular,shairez/angular,JiaLiPassion/angular,gkalpak/angular,IdeaBlade/angular,gdi2290/angular,ocombe/angular,ocombe/angular,StephenFluin/angular,gkalpak/angular,mgechev/angular,matsko/angular,mgechev/angular,Toxicable/angular,angular-indonesia/angular,wKoza/angular,blesh/angular,manekinekko/angular,snaptech/angular,matsko/angular,snaptech/angular,manekinekko/angular,alxhub/angular,manekinekko/angular,wKoza/angular,brandonroberts/angular,shairez/angular,alxhub/angular,brandonroberts/angular,shairez/angular,mgechev/angular,IdeaBlade/angular,gdi2290/angular,manekinekko/angular,alxhub/angular,ocombe/angular,IdeaBlade/angular,alxhub/angular,brandonroberts/angular,brandonroberts/angular,StephenFluin/angular,gnomeontherun/angular,gnomeontherun/angular,wKoza/angular,filipesilva/angular,JiaLiPassion/angular,gdi2290/angular,ocombe/angular,angular/angular,matsko/angular,angular-indonesia/angular,brandonroberts/angular,mgechev/angular,shairez/angular,gnomeontherun/angular,snaptech/angular,IdeaBlade/angular,angular-indonesia/angular,matsko/angular,blesh/angular,filipesilva/angular,gdi2290/angular,ocombe/angular