MDEV-25681: --relay-log{,-index} missing warning

No longer a MySQL server, "his" is the wrong pronoun for a server. Thanks Michael Newton for highlighting these problems Also changed slave -> replica.

Author: grooverdan

sql/rpl_rli.cc

@@ -203,8 +203,8 @@ a file name for --relay-log-index option", opt_relaylog_index_name);
  */
  sql_print_warning("Neither --relay-log nor --relay-log-index were used;"
  " so replication "
- "may break when this MySQL server acts as a "
- "slave and has his hostname changed!! Please "
+ "may break when this MariaDB server acts as a "
+ "replica and has its hostname changed. Please "
  "use '--log-basename=#' or '--relay-log=%s' to avoid "
  "this problem.", ln);
  name_warning_sent= 1;