update documentation-usability.md/issue-label-inclusivity.md/documentation-discoverability.md

[sanglide]

Signed-off-by: 171250022@smail.nju.edu.cn 171250022@smail.nju.edu.cn

update the following files:

https://github.com/chaoss/wg-diversity-inclusion/blob/master/focus-areas/project-and-community/documentation-usability.md
https://github.com/chaoss/wg-diversity-inclusion/blob/master/focus-areas/project-and-community/issue-label-inclusivity.md
https://github.com/chaoss/wg-dei/blob/main/focus-areas/project-and-community/documentation-discoverability.md

[eyehwan]

Looks good to me. Thank you 👍 @sanglide