Fixed a typo and updated mysqld--help test result.

mysql-test/r/mysqld--help.result

@@ -1108,6 +1108,11 @@ The following options may be given as the first argument:
  --wsrep-retry-autocommit=# 
  Max number of times to retry a failed autocommit
  statement
+ --wsrep-slave-FK-checks 
+ Should slave thread do foreign key constraint checks
+ (Defaults to on; use --skip-wsrep-slave-FK-checks to disable.)
+ --wsrep-slave-UK-checks 
+ Should slave thread do secondary index uniqueness checks
  --wsrep-slave-threads=# 
  Number of slave appliers to launch
  --wsrep-sst-auth=name 
@@ -1448,6 +1453,8 @@ wsrep-recover FALSE
 wsrep-replicate-myisam FALSE
 wsrep-restart-slave FALSE
 wsrep-retry-autocommit 1
+wsrep-slave-FK-checks TRUE
+wsrep-slave-UK-checks FALSE
 wsrep-slave-threads 1
 wsrep-sst-auth (No default value)
 wsrep-sst-donor 

sql/sys_vars.cc

@@ -4720,7 +4720,7 @@ static Sys_var_mybool Sys_wsrep_slave_FK_checks(
 
 static Sys_var_mybool Sys_wsrep_slave_UK_checks(
        "wsrep_slave_UK_checks", "Should slave thread do "
-       "secondary index uniqueness chesks",
+       "secondary index uniqueness checks",
        GLOBAL_VAR(wsrep_slave_UK_checks), 
        CMD_LINE(OPT_ARG), DEFAULT(FALSE));