docs: modify some txt tips to correct grammar

[okaybase]

Please answer these questions before submitting a pull request, or your PR will get closed.

Why submit this pull request?
Modify some txt tips to correct grammar.

• Bugfix
• New feature provided
• Improve performance
• Improve document
• Backport patches

What changes will this PR take into?

Please update this section with detailed description.

Related issues

fix/resolve #Modify some txt tips to correct grammar.

Checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

[netlify]

✔️ Deploy Preview for apisix-dashboard ready!

🔨 Explore the source changes: 52e0da8

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[codecov-commenter]

Codecov Report

Merging #1972 (52e0da8) into master (94b1a16) will decrease coverage by 2.78%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1972      +/-   ##
==========================================
- Coverage   66.79%   64.01%   -2.79%     
==========================================
  Files         182      122      -60     
  Lines        6575     3154    -3421     
  Branches      753      753              
==========================================
- Hits         4392     2019    -2373     
+ Misses       1907     1135     -772     
+ Partials      276        0     -276     

Flag	Coverage Δ
backend-e2e-test	?
backend-e2e-test-ginkgo	?
backend-unit-test	?
frontend-e2e-test	64.01% <ø> (+0.06%)	⬆️

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

Impacted Files	Coverage Δ
web/src/components/Plugin/PluginPage.tsx	98.70% <ø> (ø)
api/internal/handler/global_rule/global_rule.go
api/internal/filter/request_id.go
api/internal/core/storage/etcd.go
.../internal/handler/authentication/authentication.go
api/internal/handler/server_info/server_info.go
api/internal/log/zap.go
api/internal/filter/recover.go
api/cmd/install.go
api/internal/utils/runtime/runtime.go
... and 52 more

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[iamayushdas]

Nice catch @okaybase 👍🏻

[okaybase]

Thanks for your review. @iamayushdas @juzhiyuan

[iamayushdas]

you can cc @liuxiran @LiteSun

[okaybase]

Okay, thanks for your tip! @iamayushdas 😄