Fix more typos and inconsistencies in the tree

Author: Alexander Lakhin
Discussion: https://postgr.es/m/0a5419ea-1452-a4e6-72ff-545b1a5a8076@gmail.com

src/backend/storage/file/fd.c

@@ -1592,7 +1592,7 @@ OpenTemporaryFileInTablespace(Oid tblspcOid, bool rejectError)
  * If the file is inside the top-level temporary directory, its name should
  * begin with PG_TEMP_FILE_PREFIX so that it can be identified as temporary
  * and deleted at startup by RemovePgTempFiles().  Alternatively, it can be
- * inside a directory created with PathnameCreateTemporaryDir(), in which case
+ * inside a directory created with PathNameCreateTemporaryDir(), in which case
  * the prefix isn't needed.
  */
 File

src/backend/storage/file/sharedfileset.c

@@ -143,7 +143,7 @@ SharedFileSetOpen(SharedFileSet *fileset, const char *name)
 }
 
 /*
- * Delete a file that was created with PathNameCreateShared().
+ * Delete a file that was created with SharedFileSetCreate().
  * Return true if the file existed, false if didn't.
  */
 bool

src/backend/storage/ipc/barrier.c

@@ -113,7 +113,7 @@ BarrierInit(Barrier *barrier, int participants)
  * too and then return.  Increments the current phase.  The caller must be
  * attached.
  *
- * While waiting, pg_stat_activity shows a wait_event_class and wait_event
+ * While waiting, pg_stat_activity shows a wait_event_type and wait_event
  * controlled by the wait_event_info passed in, which should be a value from
  * one of the WaitEventXXX enums defined in pgstat.h.
  *

src/backend/storage/ipc/shm_mq.c

@@ -1238,7 +1238,7 @@ shm_mq_inc_bytes_written(shm_mq *mq, Size n)
 	/*
 	 * Separate prior reads of mq_ring from the write of mq_bytes_written
 	 * which we're about to do.  Pairs with the read barrier found in
-	 * shm_mq_get_receive_bytes.
+	 * shm_mq_receive_bytes.
 	 */
 	pg_write_barrier();