Help: Fix version notes on small screens

Commit 097d8fa7a5 (Help: Fix overlapping text in footnotes, 2025-04-21,
v4.0.2~20^2) tweaked the CSS to fix an issue with footnotes whose
content was version added/changed/removed information. This
inadvertently failed to update the 'small screen' rules, which caused
the hanging indent on these to be incorrect for small screens. Update
those rules to reflect the prior changes.