netlink: specs: fix a couple of yamllint warnings

netlink: specs: fix a couple of yamllint warnings

Clean up the remaining yamllint warnings in the netlink specs:

    [warning] comment not indented like content (comments-indentation)
    [error] too many spaces after colon (colons)

Signed-off-by: Donald Hunter <donald.hunter@gmail.com>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> # mptcp_pm.yaml
Link: https://patch.msgid.link/20250610125944.85265-8-donald.hunter@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>