fix: replace broken packaging_and_installation link

[StephNathai]

Issue number that this PR fixes:
Fixes #8162

What was wrong/why is this fix needed? (quick summary only)
The packaging_and_installation link is broken on the following pages:

• https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Internationalization
• https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/debugging_(before_firefox_50)

[github-actions]

Preview URLs

• https://pr8567.content.dev.mdn.mozit.cloud/en-US/docs/Mozilla/Add-ons/WebExtensions/Debugging_(before_Firefox_50)
• https://pr8567.content.dev.mdn.mozit.cloud/en-US/docs/Mozilla/Add-ons/WebExtensions/Internationalization

Flaws

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

URL: /en-US/docs/Mozilla/Add-ons/WebExtensions/Debugging_(before_Firefox_50)
Title: Debugging (before Firefox 50)
on GitHub
Flaw count: 3

• broken_links:
  • Can't resolve /en-US/docs/Mozilla/Add-ons/Add-on_Debugger
  • Can't resolve /en-US/docs/Mozilla/Firefox/Multiprocess_Firefox
  • Can't resolve /en-US/docs/Mozilla/Add-ons/Add-on_Debugger

External URLs

URL: /en-US/docs/Mozilla/Add-ons/WebExtensions/Debugging_(before_Firefox_50)
Title: Debugging (before Firefox 50)
on GitHub

• https://extensionworkshop.com/documentation/develop/temporary-installation-in-firefox (1 time) (Note! This may be a new URL 👀)

---

URL: /en-US/docs/Mozilla/Add-ons/WebExtensions/Internationalization
Title: Internationalization
on GitHub

• https://extensionworkshop.com/documentation/develop/temporary-installation-in-firefox (1 time) (Note! This may be a new URL 👀)

[wbamberg]

👍 thanks for the fix, @StephNathai !