ENH: refactor ctl/docs generation

[Flying-Tom]

What type of PR is this?

/kind enhancement

What this PR does / why we need it:

main in both gen.go and main.go, which will cause a gopls problem main redeclared in this block.

Refactor ctl/docs generation to erase some lint error and add syntax highlight for codeblocks.

Which issue(s) this PR fixes:
Fixes #1264

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[kmesh-bot]

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[Copilot]

Pull Request Overview

Scripts for generating kmeshctl documentation are updated to point to the new location of gen.go under the ctl/doc directory.

• Changed working directory in the docgen script to match the new gen.go location.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.27%. Comparing base (10e8eb3) to head (5ba9295).
Report is 25 commits behind head on main.

see 1 file with indirect coverage changes

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