Clarify, spelling for wsrep_strict_ddl description (#1447)

mysql-test/suite/sys_vars/r/sysvars_wsrep.result

@@ -713,7 +713,7 @@ GLOBAL_VALUE_ORIGIN	COMPILE-TIME
 DEFAULT_VALUE	OFF
 VARIABLE_SCOPE	GLOBAL
 VARIABLE_TYPE	BOOLEAN
-VARIABLE_COMMENT	Reject DDL on effected tables not supporting Galera replication
+VARIABLE_COMMENT	If set, reject DDL on affected tables not supporting Galera replication
 NUMERIC_MIN_VALUE	NULL
 NUMERIC_MAX_VALUE	NULL
 NUMERIC_BLOCK_SIZE	NULL

sql/sys_vars.cc

@@ -5666,7 +5666,7 @@ static Sys_var_mybool Sys_wsrep_desync (
        ON_UPDATE(wsrep_desync_update));
 
 static Sys_var_mybool Sys_wsrep_strict_ddl (
-       "wsrep_strict_ddl", "Reject DDL on effected tables not supporting Galera replication",
+       "wsrep_strict_ddl", "If set, reject DDL on affected tables not supporting Galera replication",
        GLOBAL_VAR(wsrep_strict_ddl),
        CMD_LINE(OPT_ARG), DEFAULT(FALSE),
        NO_MUTEX_GUARD, NOT_IN_BINLOG,