docs: clarify the IE11 deprecation timeline, and link to the RFC (#42023)
docs: clarify the IE11 deprecation timeline, and link to the RFC (#42023)

PR Close #42023

shairez/angular,JiaLiPassion/angular,brandonroberts/angular,angular-indonesia/angular,shairez/angular,gkalpak/angular,mgechev/angular,gnomeontherun/angular,JiaLiPassion/angular,gkalpak/angular,ocombe/angular,gkalpak/angular,angular/angular,mgechev/angular,angular-indonesia/angular,gkalpak/angular,manekinekko/angular,gnomeontherun/angular,angular/angular,JiaLiPassion/angular,ocombe/angular,ocombe/angular,manekinekko/angular,shairez/angular,mgechev/angular,manekinekko/angular,brandonroberts/angular,shairez/angular,brandonroberts/angular,brandonroberts/angular,angular-indonesia/angular,ocombe/angular,JiaLiPassion/angular,angular/angular,mgechev/angular,shairez/angular,manekinekko/angular,ocombe/angular,angular/angular,gnomeontherun/angular,gnomeontherun/angular,angular-indonesia/angular,mgechev/angular,manekinekko/angular,brandonroberts/angular,ocombe/angular,brandonroberts/angular,manekinekko/angular