docs: allow inline literals in paragraphs to wrap to prevent overflow

Some documentation pages contain long inline literals in paragraph
text that can force page-wide horizontal scroll overflow and break
layout on smaller screens.

Override the default `span.pre` white-space behavior for inline
literals and use `overflow-wrap: anywhere` so they can wrap when
needed. For code used as part of a paragraph, wrapping is appropriate
because it is stylistically part of the surrounding text. Code blocks,
by contrast, are meant to preserve formatting fidelity and are better
served by contained horizontal scrolling.

Examples:
https://docs.kernel.org/6.15/userspace-api/futex2.html
https://docs.kernel.org/6.15/security/IMA-templates.html

Signed-off-by: Rito Rhymes <rito@ritovision.com>
Assisted-by: Codex:GPT-5.4
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20260323151401.27415-1-rito@ritovision.com>