[docs] Fix all typos in plugins typo.

[yanggangtony]

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[docs] Fix all typos in plugins typo.
Interesting , this pr just fix 1.12 typos.
https://github.com/vmware-tanzu/velero/pull/7116/files.

Then this will go to all typos places.

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Fixes #(issue)

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• Created a changelog file or added /kind changelog-not-required as a comment on this pull request.
• Updated the corresponding documentation in site/content/docs/main.

[yanggangtony]

/kind changelog-not-required

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e58a780) 61.19% compared to head (3184359) 61.19%.
Report is 18 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7129   +/-   ##
=======================================
  Coverage   61.19%   61.19%           
=======================================
  Files         258      258           
  Lines       27366    27366           
=======================================
  Hits        16747    16747           
  Misses       9434     9434           
  Partials     1185     1185           

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