Fixed a variety of typos

[kolbe]

What problem does this PR solve?

I noticed quite a few typos and spelling/grammar problems in errors and other messages.

What is changed and how it works?

Check List

Tests

• No code

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Documentation updates may be needed in order to make sure the output of tiup matches example output in the docs.

Release notes:

NONE

[CLAassistant]

All committers have signed the CLA.

[lucklove]

Thanks, kolbe.

/lgtm

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lucklove

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

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[lucklove]

/merge

[ti-chi-bot]

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

Commit hash: e82a388

[codecov-io]

Codecov Report

Merging #1306 (baf2945) into master (3366472) will increase coverage by 26.53%.
The diff coverage is 53.84%.

❗ Current head baf2945 differs from pull request most recent head e82a388. Consider uploading reports for the commit e82a388 to get more accurate results

@@             Coverage Diff             @@
##           master    #1306       +/-   ##
===========================================
+ Coverage   26.25%   52.79%   +26.53%     
===========================================
  Files         263      289       +26     
  Lines       18947    20814     +1867     
===========================================
+ Hits         4975    10989     +6014     
+ Misses      13201     8072     -5129     
- Partials      771     1753      +982     

Flag	Coverage Δ
cluster	38.37% <0.00%> (?)
dm	26.54% <0.00%> (?)
integrate	47.08% <53.84%> (+30.58%)	⬆️
playground	24.17% <0.00%> (?)
tiup	16.49% <53.84%> (ø)
unittest	22.76% <40.00%> (ø)

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

Impacted Files	Coverage Δ
pkg/environment/env.go	58.33% <0.00%> (+2.50%)	⬆️
pkg/repository/mirror.go	39.84% <0.00%> (+0.39%)	⬆️
cmd/mirror.go	48.68% <87.50%> (ø)
pkg/cluster/operation/download.go	36.84% <0.00%> (ø)
components/playground/instance/tidb.go	81.25% <0.00%> (ø)
pkg/cluster/flags/debug.go	100.00% <0.00%> (ø)
components/playground/instance/pump.go	0.00% <0.00%> (ø)
pkg/logger/audit.go	53.33% <0.00%> (ø)
pkg/cluster/operation/action.go	63.71% <0.00%> (ø)
components/playground/instance/tiflash_config.go	100.00% <0.00%> (ø)
... and 191 more

---

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