Fix a comment issue

Change-Id: If45580f5b776ce84327e31ef8802e7e1bde503d3
diff --git a/doc/source/sampleconf.rst b/doc/source/sampleconf.rst
index c262f2d..43933db 100644
--- a/doc/source/sampleconf.rst
+++ b/doc/source/sampleconf.rst
@@ -36,7 +36,7 @@
     # are.
     test_custom_requirements = False
 
-    File path of the yaml file that defines your RBAC requirements. This
+    # File path of the yaml file that defines your RBAC requirements. This
     # file must be located on the same host that Patrole runs on. The yaml
     # file should be written as follows:
     custom_requirements_file = patrole/requirements.txt