[Fix] Fix typo in comments in mFscore

[MengzhangLI]

No description provided.

[codecov]

Codecov Report

Merging #1708 (e528d90) into master (144dc39) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1708   +/-   ##
=======================================
  Coverage   90.24%   90.24%           
=======================================
  Files         142      142           
  Lines        8486     8486           
  Branches     1432     1432           
=======================================
  Hits         7658     7658           
  Misses        588      588           
  Partials      240      240           

Flag	Coverage Δ
unittests	90.24% <ø> (ø)

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Impacted Files	Coverage Δ
mmseg/core/evaluation/metrics.py	93.61% <ø> (ø)

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