Another minor edit.

Signed-off-by: Zsolt Gyulai (zgyulai) <zsolt.gyulai@quest.com>

Author: zsoltgyulai94

doc/_admin-guide/190_The_syslog-ng_manual_pages/011_persist-tool.md

@@ -31,7 +31,8 @@ Use the `dump` command to print the current content of the persist file in JSON
 
 The `dump` command has the following options:
 * `--help` or `-?`
-Display a brief help message.
+
+    Display a brief help message.
 
 ### Example: persist-tool dump