RDMA/cm: Correct typedef and bad line warnings

RDMA/cm: Correct typedef and bad line warnings

In include/rdma/ib_cm.h:

Correct a typedef's kernel-doc notation by adding the 'typedef' keyword
to it to avoid a warning.
Add a leading " *" to a kernel-doc line to avoid a warning.

Warning: ib_cm.h:289 function parameter 'ib_cm_handler' not described
 in 'int'
Warning: ib_cm.h:289 expecting prototype for ib_cm_handler().  Prototype
 was for int() instead
Warning: ib_cm.h:484 bad line: connection message in case duplicates
 are received.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://patch.msgid.link/20251112062908.2711007-1-rdunlap@infradead.org
Signed-off-by: Leon Romanovsky <leon@kernel.org>