fix: fix some typo

[Charlie17Li]

Signed-off-by: charlie qianglin98@qq.com

What this PR does:

fix some typo

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[codecov-commenter]

Codecov Report

Merging #466 (c416cf0) into master (9279392) will not change coverage.
The diff coverage is 20.83%.

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@@           Coverage Diff           @@
##           master     #466   +/-   ##
=======================================
  Coverage   40.54%   40.54%           
=======================================
  Files         141      141           
  Lines        8791     8791           
=======================================
  Hits         3564     3564           
  Misses       4933     4933           
  Partials      294      294           

Impacted Files	Coverage Δ
pkg/datasource/sql/exec/at/at_executor.go	0.00% <0.00%> (ø)
pkg/datasource/sql/exec/at/base_executor.go	31.62% <ø> (ø)
pkg/datasource/sql/exec/at/delete_executor.go	23.46% <8.33%> (ø)
pkg/datasource/sql/exec/at/update_executor.go	25.00% <13.33%> (ø)
pkg/datasource/sql/exec/at/insert_executor.go	41.37% <33.33%> (ø)
pkg/datasource/sql/exec/at/plain_executor.go	100.00% <100.00%> (ø)

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