net: ip-sysctl: Format SCTP-related memory parameters description as bullet list

The description for vector elements of SCTP-related memory usage
parameters (sctp{r,w,}mem) is formatted as normal paragraphs rather than
bullet list. Convert the description to the latter.

Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250701031300.19088-5-bagasdotme@gmail.com


Signed-off-by: Paolo Abeni <pabeni@redhat.com>