doc: harmonize YAML comments style in deprecations.md

Refs: nodejs/remark-preset-lint-node#139

PR-URL: #35454
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Ujjwal Sharma <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Khaidi Chu <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>