doc: fix a help message of playground

[ekexium]

Signed-off-by: ekexium ekexium@gmail.com

What problem does this PR solve?

Fix a missing single quote in the help message.

What is changed and how it works?

Check List

Tests

• No code

Code changes

Side effects

Related changes

Release notes:

NONE

[CLAassistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

Merging #1429 (3c4bcdb) into master (89ebe5a) will increase coverage by 4.64%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1429      +/-   ##
==========================================
+ Coverage   25.29%   29.93%   +4.64%     
==========================================
  Files         264      276      +12     
  Lines       20660    21083     +423     
==========================================
+ Hits         5226     6312    +1086     
+ Misses      14631    13794     -837     
- Partials      803      977     +174     

Flag	Coverage Δ
integrate	21.70% <100.00%> (+6.24%)	⬆️
playground	13.73% <100.00%> (?)
tiup	15.45% <ø> (ø)
unittest	21.62% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
components/playground/main.go	46.36% <100.00%> (+43.93%)	⬆️
components/playground/instance/tikv_config.go	100.00% <0.00%> (ø)
components/playground/instance/drainer.go	0.00% <0.00%> (ø)
components/playground/instance/pd.go	73.91% <0.00%> (ø)
components/playground/instance/tiflash.go	59.09% <0.00%> (ø)
components/playground/instance/tikv.go	67.34% <0.00%> (ø)
components/playground/instance/tiflash_config.go	100.00% <0.00%> (ø)
components/playground/instance/process.go	81.39% <0.00%> (ø)
components/playground/instance/pump.go	0.00% <0.00%> (ø)
components/playground/instance/ticdc.go	0.00% <0.00%> (ø)
... and 22 more

---

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[ti-chi-bot]

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• AstroProfundis

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[AstroProfundis]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Details

Commit hash: daca42d

[ti-chi-bot]

@ekexium: Your PR was out of date, I have automatically updated it for you.

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