docs(changelog): mention CLDR update in breaking changes (#33848)
docs(changelog): mention CLDR update in breaking changes (#33848)

Angular `9.0.0-rc.2` contains an update of CLDR data to `v36.0.0`. The localized data changed for some locales, and this is breaking tests that are checking the result of i18n applications. For example, the space separator used in numbers changed from `\xa0` to `\u202f`.

This commit adds a mention to this change in the release notes, so developers can more easily understand why some of their tests are failing when updating to v9.

PR Close #33848

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