Fix typo on Chinese documents

[lunny]

As title.

[codecov-commenter]

Codecov Report

Merging #12982 into master will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #12982   +/-   ##
=======================================
  Coverage   42.60%   42.60%           
=======================================
  Files         671      671           
  Lines       73625    73625           
=======================================
+ Hits        31366    31369    +3     
+ Misses      37179    37174    -5     
- Partials     5080     5082    +2     

Impacted Files	Coverage Δ
modules/indexer/stats/db.go	60.86% <0.00%> (-8.70%)	⬇️
modules/git/repo.go	46.70% <0.00%> (-1.02%)	⬇️
services/pull/pull.go	40.78% <0.00%> (-0.50%)	⬇️
modules/queue/workerpool.go	60.00% <0.00%> (+1.22%)	⬆️
modules/queue/unique_queue_disk_channel.go	55.38% <0.00%> (+1.53%)	⬆️
modules/log/event.go	59.43% <0.00%> (+1.88%)	⬆️

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