Fix changelog bundle examples

[lcawl]

This PR cleans up some examples in https://elastic.github.io/docs-builder/contribute/bundle-changelogs/ and https://elastic.github.io/docs-builder/cli/changelog/bundle/ that seemed to be moved or lost in #3221

The how-to page focuses only on the simplest method (profile-based commands), so I've moved the option-based commands back to the command reference page.

[coderabbitai]

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Reviewing files that changed from the base of the PR and between 3575023 and cb0dcf5.

📒 Files selected for processing (1)

• docs/cli/changelog/cmd-bundle.md

✅ Files skipped from review due to trivial changes (1)

• docs/cli/changelog/cmd-bundle.md

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📝 Walkthrough

Walkthrough

This PR enhances changelog bundle documentation across two files. docs/cli/changelog/cmd-bundle.md adds an Examples section with six subsections covering bundling by GitHub release tags, issues, PRs (with sample bundle YAML), product filters (with wildcards), buildkite promotion reports, and hide-features behavior. docs/contribute/bundle-changelogs.md clarifies promotion report examples, removes obsolete cloud-serverless guidance, and tightens link_allow_repos rules to require explicit repository listing.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: fixing/reorganizing changelog bundle examples across two documentation pages by restoring and relocating content.
Description check	✅ Passed	The description clearly explains what was changed and why: restoring examples to two documentation pages that were moved or lost, keeping the how-to focused on profile-based commands while moving option-based commands to the reference page.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch changelog-bundle-docs

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@docs/cli/changelog/cmd-bundle.md`:
- Around line 172-174: The markdown contains an empty link label
"[](/cli/changelog/gh-release.md)" which renders as a blank anchor; update that
link in the changelog text to include a visible label such as "[gh-release]" or
"[docs-builder changelog gh-release]" so the reference becomes
"[gh-release](/cli/changelog/gh-release.md)" (locate the line containing the
empty brackets in the cmd-bundle.md paragraph and replace the empty label with
an appropriate, descriptive link text).

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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Reviewing files that changed from the base of the PR and between 908493a and 3575023.

📒 Files selected for processing (2)

• docs/cli/changelog/cmd-bundle.md
• docs/contribute/bundle-changelogs.md