Fix underlining of heading in REST documentation

Change-Id: I34435ebddf05347de4948b8a7605b6da8066b862
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
diff --git a/src/main/resources/Documentation/rest-api-config.md b/src/main/resources/Documentation/rest-api-config.md
index 86764ff..da78531 100644
--- a/src/main/resources/Documentation/rest-api-config.md
+++ b/src/main/resources/Documentation/rest-api-config.md
@@ -8,7 +8,7 @@
 [REST API](../../../Documentation/rest-api.html).
 
 <a id="importer-endpoints"> Importer Endpoints
----------------------------------------------
+----------------------------------------------
 
 ### <a id="import-project"> Import Project
 _PUT /config/server/@PLUGIN@~projects/[\{project-name\}](../../../Documentation/rest-api-projects.html#project-name)_