docs: fix placement typo

[Binaryify]

fix the typo:
popover support placement not position

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.61%. Comparing base (e46ad73) to head (3c71535).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13222      +/-   ##
==========================================
- Coverage   89.64%   89.61%   -0.03%     
==========================================
  Files         257      257              
  Lines        7008     7008              
  Branches     1733     1733              
==========================================
- Hits         6282     6280       -2     
- Misses        382      384       +2     
  Partials      344      344              

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[chenjiahan]

Thank you!