MDEV-15530: Variable replicate_rewrite_db cannot be found in "show global variables"

- Cosmetic fixes

Reviewer:Brandon Nesterenko <brandon.nesterenko@mariadb.com>

mysql-test/suite/binlog/t/binlog_row_mysqlbinlog_options.test

@@ -25,7 +25,7 @@ SET timestamp=1000000000;
 # Delete all existing binary logs.
 RESET MASTER;
 
-# Whe'll call mysqlbinlog with two rewrite rules:
+# We'll call mysqlbinlog with two rewrite rules:
 # --rewrite-db="test1->new_test1"
 # --rewrite-db="test3->new_test3"
 

mysql-test/suite/rpl/t/rpl_rewrt_db-slave.opt

-"--replicate-rewrite-db=test->rewrite" "--replicate-rewrite-db=mysqltest1 -> test" "--replicate-rewrite-db=x -> y" "--replicate-rewrite-db=database_master_temp_01->database_slave_temp_01" "--replicate-rewrite-db=database_master_temp_02->database_slave_temp_02" "--replicate-rewrite-db=database_master_temp_03->database_slave_temp_03"
+"--replicate-rewrite-db=test->rewrite"
+"--replicate-rewrite-db=mysqltest1 -> test"
+"--replicate-rewrite-db=x -> y"
+"--replicate-rewrite-db=database_master_temp_01->database_slave_temp_01"
+"--replicate-rewrite-db=database_master_temp_02->database_slave_temp_02"
+"--replicate-rewrite-db=database_master_temp_03->database_slave_temp_03"