added release note for ::details-content to experimental and 138

[dletorey]

Description

• Added release notes for ::details-content to:
  • Experimental features in Firefox
  • Firefox 138 for developers - experimental section

Motivation

• Working on Issue #38888

Related issues and pull requests

• Content PR
• BCD PR

[github-actions]

Preview URLs

• /en-US/docs/Mozilla/Firefox/Experimental_features
• /en-US/docs/Mozilla/Firefox/Releases/138

Flaws (1)

Note! 1 document with no flaws that don't need to be listed. 🎉

URL: /en-US/docs/Mozilla/Firefox/Experimental_features
Title: Experimental features in Firefox
Flaw count: 1

• macros:
  • Macro produces link /en-US/docs/Web/SVG/Element/discard which is a redirect

External URLs (2)

URL: /en-US/docs/Mozilla/Firefox/Experimental_features
Title: Experimental features in Firefox

• https://bugzil.la/1901037 (1 time) (Note! This may be a new URL 👀)

---

URL: /en-US/docs/Mozilla/Firefox/Releases/138
Title: Firefox 138 for developers

• https://bugzil.la/1901037 (1 time) (Note! This may be a new URL 👀)

(comment last updated: 2025-04-08 08:23:52)

[dipikabh]

LGTM, thank you for these updates!
Leaving a +1 so you can merge after addressing the suggestions if you agree with them

[github-actions]

This pull request has merge conflicts that must be resolved before it can be merged.