Fix pkg cat docs source to match generated output

[aravindtga]

Summary

PR #4505 updated the generated internal/docs/generated/pkgdocs/docs.go directly but did not update the source markdown at documentation/content/en/reference/cli/pkg/cat/_index.md. This caused make generate to overwrite the intended docs with the stale source.

Updated the source markdown to match the intended documentation from #4505.

Testing

• Tested with make generate to test the docs changes are aligned.

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[Copilot]

Pull request overview

Updates the source Markdown for kpt pkg cat CLI reference docs so that future make generate runs produce the intended generated Go doc output (previously, generated docs were updated directly, causing regeneration to revert the change).

Changes:

• Update cat command short/long descriptions to “Print the contents of a package”.
• Update args and examples to reflect printing package contents (including non-KRM files and skipping binaries).

Comments suppressed due to low confidence (1)

documentation/content/en/reference/cli/pkg/cat/_index.md:30

• Args description says only "KRM resources (YAML/JSON) are formatted by default", but kpt pkg cat also formats/displays Kptfile content as YAML. Consider explicitly mentioning Kptfile here (or avoid implying only YAML/JSON files are formatted) to match actual behavior/tests.

  Path to a file or a directory containing a kpt package. Displays all
  package files: KRM resources (YAML/JSON) are formatted by default,
  and non-KRM text files (e.g., README.md) are shown as raw content.
  Binary files are skipped. Defaults to the current directory.

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