Fix code block in documentation

An empty line is required before a code block otherwise it is not
displayed.

Change-Id: Ib0e8762e29f99ee9f4c288cdf126d2be51d75d37
diff --git a/src/main/resources/Documentation/config.md b/src/main/resources/Documentation/config.md
index 8bf28c1..e46aad4 100644
--- a/src/main/resources/Documentation/config.md
+++ b/src/main/resources/Documentation/config.md
@@ -141,6 +141,7 @@
 limits are defined per user group and rate limit type:
 
 Example:
+
 ```
 [group "buildserver"]
     uploadpack = 10 / min burst 500