Weekly spelling check

[github-actions]

Typos and unknown words:

• files/en-us/learn_web_development/extensions/forms/styling_web_forms/index.md - Unknown words (broc, cauli)
• files/en-us/web/api/document/arianotify/index.md - Unknown words (announcments, pronounciation)
• files/en-us/web/api/element/arianotify/index.md - Unknown words (aint, announcments)
• files/en-us/web/html/reference/elements/iframe/index.md - Unknown words (framebusting)

Tip

If the word is actually valid or it is required to be ignored, consider adding it to one of the dictionaries under .vscode/dictionaries.