Merge branch 'another-ip-sysctl-docs-cleanup'

Bagas Sanjaya says:

====================
Another ip-sysctl docs cleanup

Inspired by Abdelrahman's cleanup [1]. This time, mostly formatting
conversion to bullet lists.

[1]: https://lore.kernel.org/linux-doc/20250624150923.40590-1-abdelrahmanfekry375@gmail.com/
====================

Link: https://patch.msgid.link/20250701031300.19088-1-bagasdotme@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>