*: minor fix for log refinement (#2916)

[ti-srebot]

cherry-pick #2916 to release-4.0

---

What problem does this PR solve?

Related to #2704.

What is changed and how it works?

This PR fixes some logs which are not consistent by mistake.

Check List

Tests

• Unit test

Related changes

• Need to cherry-pick to the release branch

Release note

[Yisaer]

LGTM

[lhy1024]

/merge

[rleungx]

/merge

[ti-srebot]

/run-all-tests

[HunDunDM]

LGTM

[codecov]

Codecov Report

Merging #2918 into release-4.0 will increase coverage by 0.04%.
The diff coverage is 16.66%.

@@               Coverage Diff               @@
##           release-4.0    #2918      +/-   ##
===============================================
+ Coverage        77.26%   77.30%   +0.04%     
===============================================
  Files              209      209              
  Lines            22850    22850              
===============================================
+ Hits             17655    17665      +10     
+ Misses            3855     3842      -13     
- Partials          1340     1343       +3     

Impacted Files	Coverage Δ
server/cluster/cluster.go	80.89% <0.00%> (-0.41%)	⬇️
server/region_syncer/client.go	80.29% <0.00%> (ø)
server/schedule/checker/replica_checker.go	83.43% <0.00%> (ø)
server/tso/tso.go	79.74% <0.00%> (-1.27%)	⬇️
server/server.go	76.18% <50.00%> (-0.89%)	⬇️
pkg/etcdutil/etcdutil.go	86.30% <0.00%> (-2.74%)	⬇️
server/core/storage.go	72.86% <0.00%> (-0.78%)	⬇️
server/grpc_service.go	59.77% <0.00%> (-0.76%)	⬇️
... and 7 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a1d3230...5becb79. Read the comment docs.