docs: add code format in content projection guide (#44907)
docs: add code format in content projection guide (#44907)

PR Close #44907

gnomeontherun/angular,manekinekko/angular,angular/angular,shairez/angular,JiaLiPassion/angular,shairez/angular,gkalpak/angular,manekinekko/angular,JiaLiPassion/angular,angular/angular,angular/angular,angular-indonesia/angular,angular/angular,manekinekko/angular,angular-indonesia/angular,gkalpak/angular,gkalpak/angular,JiaLiPassion/angular,gnomeontherun/angular,gnomeontherun/angular,shairez/angular,manekinekko/angular,manekinekko/angular,shairez/angular,shairez/angular,angular-indonesia/angular,angular-indonesia/angular,gnomeontherun/angular,manekinekko/angular,gkalpak/angular,JiaLiPassion/angular