fix some typos

[180909]

What type of PR is this?

• bug
• feature
• enhancement

What problem(s) does this PR solve?

Issue(s) number:

Description:

How do you solve it?

Special notes for your reviewer, ex. impact of this fix, design document, etc:

Checklist:

Tests:

• Unit test(positive and negative cases)
• Function test
• Performance test
• N/A

Affects:

• Documentation affected (Please add the label if documentation needs to be modified.)
• Incompatibility (If it breaks the compatibility, please describe it and add the label.）
• If it's needed to cherry-pick (If cherry-pick to some branches is required, please label the destination version(s).)
• Performance impacted: Consumes more CPU/Memory

Release notes:

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ex. Fixed the bug .....

[CLAassistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

Base: 84.70% // Head: 84.72% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (ddabccb) compared to base (9c745d5).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4656      +/-   ##
==========================================
+ Coverage   84.70%   84.72%   +0.01%     
==========================================
  Files        1358     1358              
  Lines      135632   135643      +11     
==========================================
+ Hits       114892   114921      +29     
+ Misses      20740    20722      -18     

Impacted Files	Coverage Δ
src/clients/meta/MetaClient.h	92.30% <ø> (ø)
src/kvstore/raftex/RaftPart.cpp	69.69% <ø> (-1.33%)	⬇️
src/storage/exec/HashJoinNode.h	94.28% <ø> (ø)
src/storage/test/IndexWriteTest.cpp	99.70% <ø> (ø)
src/common/conf/test/ConfigurationTest.cpp	99.21% <100.00%> (ø)
src/graph/planner/match/StartVidFinder.cpp	87.50% <0.00%> (-5.84%)	⬇️
src/graph/planner/Planner.cpp	75.00% <0.00%> (-5.00%)	⬇️
src/kvstore/wal/WalFileIterator.cpp	64.40% <0.00%> (-4.24%)	⬇️
src/kvstore/raftex/Host.cpp	72.34% <0.00%> (-3.86%)	⬇️
src/kvstore/Part.cpp	53.69% <0.00%> (-2.08%)	⬇️
... and 35 more

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