tipc: socket: remove Excess struct member kernel-doc warning

Remove a kernel-doc description to squelch a warning:

socket.c:143: warning: Excess struct member 'blocking_link' description in 'tipc_sock'

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jon Maloy <jmaloy@redhat.com>
Cc: Ying Xue <ying.xue@windriver.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20240123051201.24701-1-rdunlap@infradead.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>