Fix documentation

Author: yakatz

REFERENCE.md

@@ -1186,28 +1186,29 @@ Default value: `$gitlab::skip_post_deployment_migrations`
 ### <a name="gitlab--custom_hook"></a>`gitlab::custom_hook`
 
 Custom hooks can be created as a pre-receive, post-receive, or update hook.
-It is possible to create different custom hook types for the same project - one each for pre-receive, post-receive and update.
+Only one of each is currently supported by this module.
 
 #### Examples
 
 ##### Custom hook usage
 
 ```puppet
 gitlab::custom_hook { 'my_custom_hook':
-  namespace       => 'my_group',
-  project         => 'my_project',
-  type            => 'post-receive',
-  source          => 'puppet:///modules/my_module/post-receive',
+  namespace      => 'my_group',
+  project        => 'my_project',
+  type           => 'post-receive',
+  source         => 'puppet:///modules/my_module/post-receive',
 }
 ```
 
 ##### Calculate hashed storage path
 
 ```puppet
 gitlab::custom_hook { 'my_custom_hook':
-  project         => 93,
-  type            => 'post-receive',
-  source          => 'puppet:///modules/my_module/post-receive',
+  project        => 93,
+  hashed_storage => true,
+  type           => 'post-receive',
+  source         => 'puppet:///modules/my_module/post-receive',
 }
 # Hook path will be `@hashed/6e/40/6e4001871c0cf27c7634ef1dc478408f642410fd3a444e2a88e301f5c4a35a4d`
 ```

manifests/custom_hook.pp

@@ -2,21 +2,22 @@
 #     Manage custom hook files within a GitLab project.
 #
 # Custom hooks can be created as a pre-receive, post-receive, or update hook.
-# It is possible to create different custom hook types for the same project - one each for pre-receive, post-receive and update.
+# Only one of each is currently supported by this module.
 #
 # @example Custom hook usage
 #   gitlab::custom_hook { 'my_custom_hook':
-#     namespace       => 'my_group',
-#     project         => 'my_project',
-#     type            => 'post-receive',
-#     source          => 'puppet:///modules/my_module/post-receive',
+#     namespace      => 'my_group',
+#     project        => 'my_project',
+#     type           => 'post-receive',
+#     source         => 'puppet:///modules/my_module/post-receive',
 #   }
 #
 # @example Calculate hashed storage path
 #   gitlab::custom_hook { 'my_custom_hook':
-#     project         => 93,
-#     type            => 'post-receive',
-#     source          => 'puppet:///modules/my_module/post-receive',
+#     project        => 93,
+#     hashed_storage => true,
+#     type           => 'post-receive',
+#     source         => 'puppet:///modules/my_module/post-receive',
 #   }
 #   # Hook path will be `@hashed/6e/40/6e4001871c0cf27c7634ef1dc478408f642410fd3a444e2a88e301f5c4a35a4d`
 #