fix small typos

[rambohe-ch]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line:
/kind bug
/kind documentation
/kind enhancement
/kind good-first-issue
/kind feature
/kind question
/kind design
/sig ai
/sig iot
/sig network
/sig storage

/kind enhancement

What this PR does / why we need it:

fix small typos.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

other Note

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.69%. Comparing base (0e6c0d4) to head (5140353).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2296      +/-   ##
==========================================
- Coverage   45.70%   45.69%   -0.01%     
==========================================
  Files         408      408              
  Lines       27146    27146              
==========================================
- Hits        12407    12405       -2     
- Misses      13516    13517       +1     
- Partials     1223     1224       +1     

Flag	Coverage Δ
unittests	45.69% <ø> (-0.01%)	⬇️

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[rambohe-ch]

@zyjhtangtang @YTGhost PTAL

[vie-serendipity]

/LGTM @rambohe-ch

[YTGhost]

LGTM