Use underscores not dashes

Use underscores not dashes so db name, user, pass are clickable.

local-config-sample.php

@@ -6,7 +6,7 @@ In it, you *must* include the four main database defines
 You may include other settings here that you only want enabled on your local development checkouts
 */
 
-define( 'DB_NAME', 'local-db-name' );
-define( 'DB_USER', 'local-db-user' );
-define( 'DB_PASSWORD', 'local-db-password' );
+define( 'DB_NAME', 'local_db_name' );
+define( 'DB_USER', 'local_db_user' );
+define( 'DB_PASSWORD', 'local_db_password' );
 define( 'DB_HOST', 'localhost' ); // Probably 'localhost'