Add AioUringCompletion in wait_event_names.txt

Oversight in c325a76, where the LWLock tranche AioUringCompletion
has been added.

Author: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Discussion: https://postgr.es/m/aDT5sBOxJTdulXnE@paquier.xyz

Author: michaelpq

src/backend/utils/activity/wait_event_names.txt

@@ -401,6 +401,7 @@ SerialSLRU	"Waiting to access the serializable transaction conflict SLRU cache."
 SubtransSLRU	"Waiting to access the sub-transaction SLRU cache."
 XactSLRU	"Waiting to access the transaction status SLRU cache."
 ParallelVacuumDSA	"Waiting for parallel vacuum dynamic shared memory allocation."
+AioUringCompletion	"Waiting for another process to complete IO via io_uring."
 
 # No "ABI_compatibility" region here as WaitEventLWLock has its own C code.