Fix MIME type for WebDriverBiDi captureScreenshot command

[juliandescottes]

"image/jpg" is not a valid image MIME type, we should advise to use "image/jpeg" instead.

[github-actions]

Preview URLs

• /en-US/docs/Mozilla/Firefox/Releases/135

External URLs (1)

URL: /en-US/docs/Mozilla/Firefox/Releases/135
Title: Firefox 135 for developers

• https://bugzilla.mozilla.org/show_bug.cgi?id=1861737 (1 time) (Note! This may be a new URL 👀)

(comment last updated: 2025-02-26 11:44:52)

[lutien]

Thanks for the fix!

[bsmth]

Noting there's two other occurrences:

./files/en-us/web/css/url_function/index.md:url("data:image/jpg;base64,iRxVB0…");
./files/en-us/learn_web_development/extensions/server-side/node_server_without_framework/index.md:  jpg: "image/jpg",

[bsmth]

Let's merge this and I'll get the other two. Thanks, both!