Add global-system-config update for LLGR

PROD-16774

Change-Id: I56922b603b65a03f798f1fb7b6f03676e177d510
diff --git a/README.rst b/README.rst
index bebe7d7..2f55b18 100644
--- a/README.rst
+++ b/README.rst
@@ -911,6 +911,26 @@
           ip_address: 172.16.0.12
           dpdk_enabled: True
 
+
+Enforcing global system config
+
+.. code-block:: yaml
+
+  opencontrail:
+    client:
+      ...
+      global_system_config:
+        name: default-global-system-config
+        asn: 64512
+        grp:
+          enable: true
+          restart_time: 60
+          end_of_rib_timeout: 30
+          bgp_helper_enable: false
+          xmpp_helper_enable: false
+          long_lived_restart_time: 300
+
+
 Enforcing global vrouter config
 
 .. code-block:: yaml
@@ -927,6 +947,8 @@
           - 'default-global-system-config'
           - 'default-global-vrouter-config'
 
+
+
 Enforcing control nodes
 
 .. code-block:: yaml