Documentation: assoc_array: Indent function explanation text

Documentation: assoc_array: Indent function explanation text

Paragraphs of function explanation are currently not indented following
their appropriate numbered list item, which causes only the first
paragraph and function prototype code blocks to be indented in the
numbered list in htmldocs output.

Indent the explanation.

Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20251013095630.34235-3-bagasdotme@gmail.com>