Add #25546 and #25817 to changelog [ci skip]

[philipqnguyen]

@javan's fix for ETag templates in #25546, and later extended in #25817 should be in the changelog.

[rails-bot]

Thanks for the pull request, and welcome! The Rails team is excited to review your changes, and you should hear from @sgrif (or someone else) soon.

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[javan]

✌️️

[prathamesh-sonpatki]

Please add a full stop at the end.

[philipqnguyen]

Thanks for catching that @prathamesh-sonpatki. I amended this commit and added a full stop.