Improve config documentation

- improve formatting
- mention that project specific reviewers.config is stored in the
  project's refs/meta/config branch

Change-Id: I55c205a75361d0e420f5c54b61a862bd4fe5e579
diff --git a/src/main/resources/Documentation/config.md b/src/main/resources/Documentation/config.md
index 5c375d4..0c4f523 100644
--- a/src/main/resources/Documentation/config.md
+++ b/src/main/resources/Documentation/config.md
@@ -1,5 +1,6 @@
-Configuration
-=============
+# Configuration
+
+## Global configuration
 
 Global configuration of the @PLUGIN@ plugin is done in the
 `reviewers.config` file in the site's `etc` directory.
@@ -12,35 +13,43 @@
     mergeFilters = true
 ```
 
-reviewers.enableREST
-:	Enable the REST API. When set to false, the REST API is not available.
-	Defaults to true.
+**reviewers.enableREST**
+: Enable the REST API. When set to `false`, the REST API is not available.
+  Defaults to `true`.
 
-reviewers.suggestOnly
-:	Provide the configured reviewers as suggestions in the "Add Reviewer" dialog
-	instead of automatically adding them to the change. Only supports accounts;
-	groups are not suggested. Defaults to false. By default Gerrit will consider
-	the suggestions with a weight of 1. To force the suggestions higher in the
-	list, set a higher value (like 1000) in `addReviewer.@PLUGIN@-reviewer-suggestion.weight`
-	in `gerrit.config`.
+**reviewers.suggestOnly**
+: Provide the configured reviewers as suggestions in the "Add Reviewer" dialog
+  instead of automatically adding them to the change. Only supports accounts;
+  groups are not suggested. Defaults to `false`. By default Gerrit will consider
+  the suggestions with a weight of 1. To force the suggestions higher in the
+  list, set a higher value (like 1000) in `addReviewer.@PLUGIN@-reviewer-suggestion.weight`
+  in `gerrit.config`.
 
-reviewers.ignoreWip
-:	Ignore changes in WIP state. When set to true changes in WIP state are not
-	considered when adding reviewers. Defaults to true. To enable adding
-	reviewers on changes in WIP state set this value to false.
+**reviewers.ignoreWip**
+: Ignore changes in WIP state. When set to `true` changes in WIP state are not
+  considered when adding reviewers. Defaults to `true`. To enable adding
+  reviewers on changes in WIP state set this value to `false`.
 
-reviewers.mergeFilters
-:	Decides whether to merge the filter-sections from parent projects or not.
-	If set to false	filter-sections in child project will override
-	filter-sections, with identical filters, in the parent project(s).
-	Defaults to true.
+**reviewers.mergeFilters**
+: Decides whether to merge the filter-sections from parent projects or not.
+  If set to `false`	filter-sections in child project will override
+  filter-sections, with identical filters, in the parent project(s).
+  Defaults to `true`.
+
+## Per project configuration
 
 Per project configuration of the @PLUGIN@ plugin is done in the
-`reviewers.config` file of the project. Missing values are inherited
-from the parent projects. This means a global default configuration can
-be done in the `reviewers.config` file of the `All-Projects` root project.
-Other projects can then override the configuration in their own
-`reviewers.config` file.
+`reviewers.config` file of the `refs/meta/config` branch of the project.
+Missing values are inherited from the parent projects. This means a global
+default configuration can be done in the `reviewers.config` file of the
+`All-Projects` root project. Other projects can then override the configuration
+in their own `reviewers.config` file.
+
+Editing per project configuration requires
+[Owner](Documentation/access-control.html#category_owner) or
+[Administrator](Documentation/access-control.html#administrators) privileges.
+Per project configuration can be edited in the Web UI, find corresponding actions
+on the project's [repo command page](Documentation/user-inline-edit.html).
 
 ```
   [filter "*"]
@@ -55,26 +64,26 @@
 
 ```
 
-filter.\<filter\>.reviewer
-:	An account or a group name. Must be an exact match (case sensitive) with the
-	account's email address or username, or the group name.  Multiple `reviewer`
-	occurrences are allowed.\
-	**NOTE**: *Reviewers are added in the context of the uploader which means
-	that if a group is configured it needs to be visible to the uploader for
-	reviewers to be added.*
+**filter.\<filter\>.reviewer**
+: An account or a group name. Must be an exact match (case sensitive) with the
+  account's email address or username, or the group name.  Multiple `reviewer`
+  occurrences are allowed.\
+  **NOTE**: *Reviewers are added in the context of the uploader which means
+  that if a group is configured it needs to be visible to the uploader for
+  reviewers to be added.*
 
-filter.\<filter\>.cc
-:	An account or a group name. Must be an exact match (case sensitive) with the
-	account's email address or username, or the group name.  Multiple `cc`
-	occurrences are allowed.
+**filter.\<filter\>.cc**
+: An account or a group name. Must be an exact match (case sensitive) with the
+  account's email address or username, or the group name.  Multiple `cc`
+  occurrences are allowed.
 
-##Multiple filter matches
+## Multiple filter matches
 
 The plugin supports multiple filter matches.
 If a reviewer, according to filter matches, should be added as both `reviewer` and `cc`,
 `reviewer` takes precedence.
 
-###Example
+### Example
 
 ```
   [filter "file:^build/modules/.*"]