fix(writing guidelines): Mention recommended sources for lorem ipsum

[OnkarRuikar]

• addresses ci(cspell-bot): group words by file to reduce log size #38575 (comment)

The CSpell recognizes the standard lorem ipsum text. It reports other versions of lorem ipsum as unknown words. We also need to maintain consistency.

We don't want authors to use other versions of the filler text.

[github-actions]

Preview URLs

• /en-US/docs/MDN/Writing_guidelines/Writing_style_guide

External URLs (2)

URL: /en-US/docs/MDN/Writing_guidelines/Writing_style_guide
Title: Writing style guide

• https://marketplace.visualstudio.com/items?itemName=Tyriar.lorem-ipsum (1 time) (Note! This may be a new URL 👀)
• https://www.lipsum.com (1 time) (Note! This may be a new URL 👀)

[Josh-Cena]

I think this should be put somewhere standalone. It's a editorial standardization, not just a technical change.

[Josh-Cena]

Copying over #38671 (comment):

regarding the lipsum in the container query page: it appears to me that https://www.lipsum.com/, when requested different number of paragraphs, returns different texts, so it seems we are confined to only 5 paragraphs for the default text that https://www.lipsum.com/feed/html returns, but then we can't really re-implement that example unless we duplicate the text for every fake section—which we can but will look less natural. Should we solidify that in the writing guidelines as well (only use the 5-paragraph version)?