mysqldump: use proper filename token for all examples

pages/common/mysqldump.md

@@ -5,7 +5,7 @@
 
 - Create a backup (user will be prompted for a password):
 
-`mysqldump --user {{user}} --password {{database_name}} -r {{filename.sql}}`
+`mysqldump --user {{user}} --password {{database_name}} -r {{path/to/file.sql}}`
 
 - Restore a backup (user will be prompted for a password):
 
@@ -13,8 +13,8 @@
 
 - Backup all databases redirecting the output to a file (user will be prompted for a password):
 
-`mysqldump --user {{user}} --password --all-databases > {{filename.sql}}`
+`mysqldump --user {{user}} --password --all-databases > {{path/to/file.sql}}`
 
 - Restore all databases from a backup (user will be prompted for a password):
 
-`mysqldump --user {{user}} --password < {{filename.sql}}`
+`mysqldump --user {{user}} --password < {{path/to/file.sql}}`