Update mysql.md

Added an example with a database on a different host.

pages/common/mysql.md

@@ -8,7 +8,11 @@
 
 - Connect to a database using credentials
 
-`mysql -u {{user}} -p{{password}} {{database_name}}`
+`mysql -h {{database_host}} -u {{user}} -p{{password}} {{database_name}}`
+
+- Connect to a database on a different host. MySQL will prompt for a password if none is supplied.
+
+`mysql -h {{database_host}} -u {{user}} -p {{database_name}}`
 
 - Execute SQL statements in a script file (batch file)