[harshitethic]

Summary\n- Replace an absent internal OPDS document reference with a link to the checked-in OPDS README.\n- Clarify that the historical carousel-batch plan was superseded by the actual OPDS fix.\n- Remove the undocumented .pam migration claim from contributor guidance.\n\n## Validation\n- git diff --check\n- git grep -n -E "opds-system\\.md|\\.pam" -- docs/ (no remaining matches)\n- Confirmed docs/opds/README.md exists.\n\nFixes #13852.

[openlibrary-bot]

Thanks for the PR, @harshitethic, and welcome to Open Library's contributor community! 🎉

The linked issue hasn't been triaged yet — triage happens on Mondays and Fridays. There are currently 63 open non-draft PRs ahead of yours.

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• PR description — not empty; explains what the change does and how to verify it
• References an issue — PR body contains a #NNN reference
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