[2026-05-26] Sync upstream commit 530b5da

## Upstream commit
  - **SHA**: `530b5dadb1304dc185df6a89d98b941661c6bd38`
  - **Date**: 2026-05-26
  - **Author**: Luc Mcgrady
  - **Link**: https://github.com/ankitects/anki-manual/commit/530b5dadb1304dc185df6a89d98b941661c6bd38

  ## Message
  Add removed notice for CMRR (#441)

* Add removed warning

* Update src/deck-options.md