Clarify when "string" should be used (and be escaped), and when "template.HTML" should be used (no need to escape) And help PRs like #29059 , to render the error messages correctly.
Before:  After:   --------- Co-authored-by: silverwind <[email protected]> Co-authored-by: Giteabot <[email protected]> Co-authored-by: wxiaoguang <[email protected]> Co-authored-by: Lunny Xiao <[email protected]>