Weekly spelling check

[github-actions]

Typos and unknown words:

• files/en-us/web/css/colon-moz-broken/index.md:13:116 - Unknown word (eextension)

Tip

To exclude words from the spellchecker, you can add valid words (web technology terms or abbreviations) to the terms-abbreviations.txt dictionary for IDE autocompletion. To ignore strings that are not words (`AABBCC` in code, for instance), you can add them to ignore-list.txt.