Fix typo in bgworker.c

src/backend/postmaster/bgworker.c

@@ -828,7 +828,7 @@ RegisterDynamicBackgroundWorker(BackgroundWorker *worker,
 	/*
 	 * We can't register dynamic background workers from the postmaster. If
 	 * this is a standalone backend, we're the only process and can't start
-	 * any more.  In a multi-process environement, it might be theoretically
+	 * any more.  In a multi-process environment, it might be theoretically
 	 * possible, but we don't currently support it due to locking
 	 * considerations; see comments on the BackgroundWorkerSlot data
 	 * structure.