docs(context): align inline comments in GetPostForm example

[leehainuo]

Description

This PR improves the formatting consistency of inline comments in the GetPostForm function documentation example.

Changes

• Align inline comments in GetPostForm example code (lines 622-623)
• Improve visual consistency and readability of the documentation

Before:

//	    email=mail@example.com  -->  ("mail@example.com", true) := GetPostForm("email") // set email to "mail@example.com"
//		   email=                  -->  ("", true) := GetPostForm("email") // set email to ""
//	                            -->  ("", false) := GetPostForm("email") // do nothing with email

After:

//	    email=mail@example.com  -->  ("mail@example.com", true) := GetPostForm("email") // set email to "mail@example.com"
//		email=                  -->  ("", true) := GetPostForm("email")                 // set email to ""
//	                            -->  ("", false) := GetPostForm("email")                // do nothing with email

Motivation

• Maintain consistent comment formatting across documentation
• Improve code readability for developers reading the documentation

Testing

• All existing tests pass
• No functional code changes, documentation only

Pull Request Checklist

Please ensure your pull request meets the following requirements:

• Open your pull request against the master branch.
• All tests pass in available continuous integration systems (e.g., GitHub Actions).
• Tests are added or modified as needed to cover code changes.
• If the pull request introduces a new feature, the feature is documented in the docs/doc.md.

Thank you for contributing!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.37%. Comparing base (3dc1cd6) to head (b73528c).
⚠️ Report is 276 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4675      +/-   ##
==========================================
- Coverage   99.21%   98.37%   -0.84%     
==========================================
  Files          42       48       +6     
  Lines        3182     3138      -44     
==========================================
- Hits         3157     3087      -70     
- Misses         17       42      +25     
- Partials        8        9       +1     

Flag	Coverage Δ
	?
--ldflags="-checklinkname=0" -tags sonic	98.36% <ø> (?)
-tags go_json	98.29% <ø> (?)
-tags nomsgpack	98.35% <ø> (?)
go-1.18	?
go-1.19	?
go-1.20	?
go-1.21	?
go-1.25	98.37% <ø> (?)
go-1.26	98.37% <ø> (?)
macos-latest	98.37% <ø> (-0.84%)	⬇️
ubuntu-latest	98.37% <ø> (-0.84%)	⬇️

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