pgsql: Update outdated references to the SLRU ControlLock

Update outdated references to the SLRU ControlLock SLRU bank locks are referred as "bank locks" or "SLRU bank locks" in the code comments. The comments updated in this commit use the latter term. Oversight in 53c2a97a9266, that has replaced the single ControlLock by the bank control locks. Auth

pgsql: Update outdated references to the SLRU ControlLock

Update outdated references to the SLRU ControlLock SLRU bank locks are referred as "bank locks" or "SLRU bank locks" in the code comments. The comments updated in this commit use the latter term. Oversight in 53c2a97a9266, that has replaced the single ControlLock by the bank control locks. Auth

pgsql: Update outdated references to the SLRU ControlLock

Update outdated references to the SLRU ControlLock SLRU bank locks are referred as "bank locks" or "SLRU bank locks" in the code comments. The comments updated in this commit use the latter term. Oversight in 53c2a97a9266, that has replaced the single ControlLock by the bank control locks. Auth