Fix typo.

Reported-By: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/YRIlNQhLNfx555Nx@paquier.xyz

src/backend/utils/init/postinit.c

@@ -537,7 +537,7 @@ BaseInit(void)
 	InitBufferPoolAccess();
 
 	/*
-	 * Initialize temporary file access after pgstat, so that the temorary
+	 * Initialize temporary file access after pgstat, so that the temporary
 	 * file shutdown hook can report temporary file statistics.
 	 */
 	InitTemporaryFileAccess();