Fix inconsistent LWLock tranche names for MultiXact*

The terms used in wait_event_names.txt and lwlock.c were inconsistent
for MultiXactOffsetSLRU and MultiXactMemberSLRU, which could cause joins
between pg_wait_events and pg_stat_activity to fail.  lwlock.c is
adjusted in this commit to what the historical name of the event has
always been, and what is documented.

Oversight in 53c2a97a9266.  08b9b9e043bb has fixed a similar
inconsistency some time ago.

Author: Bertrand Drouvot <bertranddrouvot...@gmail.com>
Reviewed-by: Álvaro Herrera <alvhe...@kurilemu.de>
Discussion: 
https://postgr.es/m/ahdxn0d0hkxzh...@ip-10-97-1-34.eu-west-3.compute.internal
Backpatch-through: 17

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/a493e741d32b7580abe4d0dcc444fcedd8feec6e

Modified Files
--------------
src/backend/storage/lmgr/lwlock.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

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