Docs/alignment fix for the HTML Tag Processor

[aristath]

What?

Fixes the alignment in some docs.

Why?

Came up in #47958 (review)

[github-actions]

Flaky tests detected in f6073d9.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/4351969536
📝 Reported issues:

• [Flaky Test] default to the only existing classic menu if there are no block menus #48033 in /test/e2e/specs/editor/blocks/navigation.spec.js
• [Flaky Test] should navigate block hierarchy using only the keyboard #47640 in specs/editor/various/block-hierarchy-navigation.test.js
• [Flaky Test] shouldn't conflict with server-side autosave #35176 in specs/editor/various/autosave.test.js

[dmsnell]

ah I should have waited a little longer. I meant to suggest fixing this in Core, and now some other folks have fixed it as part of other work. thanks anyway for proposing this here.

I think it's best now to close this out because we'll pull in the updates in a normal backport from Core into Gutenberg.

sorry for the confusion.