More reformatting of the config-gerrit page

Add a pointer to replication.config, we'll have other files
listed here as well soon.

Signed-off-by: Shawn O. Pearce <sop@google.com>
diff --git a/Documentation/config-gerrit.txt b/Documentation/config-gerrit.txt
index 0c8be11..4c319a0 100644
--- a/Documentation/config-gerrit.txt
+++ b/Documentation/config-gerrit.txt
@@ -1,16 +1,28 @@
 Gerrit2 - Configuration
 =======================
 
-Several columns in the `system_config` table may be set to control
-how Gerrit behaves.
+File `replication.config`
+-------------------------
+
+The `replication.config` file under `'$site_path'` controls how
+Gerrit automatically replicates changes it makes to any of the Git
+repositories under its control.
+
+* link:config-replication.html[Git Replication/Mirroring]
+
+Database system_config
+----------------------
+
+Several columns in the `system_config` table within the metadata
+database may be set to control how Gerrit behaves.
 
 [NOTE]
 The contents of the `system_config` table are cached at startup
 by Gerrit.  If you modify any columns in this table, Gerrit needs
 to be restarted before it will use the new values.
 
-system_config: Configurable Parameters
---------------------------------------
+Configurable Parameters
+~~~~~~~~~~~~~~~~~~~~~~~
 
 max_session_age::
 +
@@ -188,8 +200,8 @@
 ====
 
 
-system_config: Not User Serviceable
------------------------------------
+Not User Serviceable
+~~~~~~~~~~~~~~~~~~~~
 
 These fields generally shouldn't be modified.
 
diff --git a/Documentation/index.txt b/Documentation/index.txt
index ccd4aca..d61be73 100644
--- a/Documentation/index.txt
+++ b/Documentation/index.txt
@@ -27,7 +27,7 @@
 Configuration
 -------------
 
-* link:config-gerrit.html[system_config Settings]
+* link:config-gerrit.html[System Settings]
 * link:config-contact.html[User Contact Information]
 * link:config-replication.html[Git Replication/Mirroring]
 * link:config-gitweb.html[Gitweb Integration]
diff --git a/Documentation/install.txt b/Documentation/install.txt
index a83f229..4551e45 100644
--- a/Documentation/install.txt
+++ b/Documentation/install.txt
@@ -179,7 +179,7 @@
 * link:config-replication.html[Git Replication/Mirroring]
 * link:config-headerfooter.html[Site Header/Footer]
 * link:config-gitweb.html[Gitweb Integration]
-* link:config-gerrit.html[Other system_config Settings]
+* link:config-gerrit.html[Other System Settings]
 
 
 Application Deployment