docs(claude-md): drop literal ``command`` example, link RST quickref instead

The previous wording `Inline code: use double backticks (\`\`command\`\`)`
included literal backslashes intended to escape the inner backticks.
Markdown doesn't interpret backslashes inside code spans, so the
backslashes rendered verbatim — the rendered output read as
\`\`command\`\` instead of the intended ``command``.

Replace with a prose-only line that links the RST docutils quickref
(Inline markup section). No literal RST snippet to escape; rendering
is straightforward.

Same fix applied symmetrically across [#1902](https://github.com/vyos/vyos-documentation/pull/1902)/[#1906](https://github.com/vyos/vyos-documentation/pull/1906)/[#1907](https://github.com/vyos/vyos-documentation/pull/1907) — the
trio is byte-identical (md5 `bdea8e5c...`).

\xf0\x9f\xa4\x96 Generated by [robots](https://vyos.io)

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