Various minor fixes and code comments

dbutils.c

@@ -1374,7 +1374,7 @@ update_node_record_set_master(PGconn *conn, int this_node_id)
 	initPQExpBuffer(&query);
 
 	appendPQExpBuffer(&query,
-					  "  UPDATE repmgr.repl_nodes "
+					  "  UPDATE repmgr.nodes "
 					  "     SET active = FALSE "
 					  "   WHERE type = 'master' "
 					  "     AND active IS TRUE ");

repmgr-client.c

@@ -172,6 +172,10 @@ main(int argc, char **argv)
 				}
 				break;
 			case 'V':
+				/*
+				 * in contrast to repmgr3 and earlier, we only display the repmgr version
+				 * as it's not specific to a particular PostgreSQL version
+				 */
 				printf("%s %s\n", progname(), REPMGR_VERSION);
 				exit(SUCCESS);