Merge "Update user-guide."

diff --cc docs/user-guide/index.rst
index 0970609c1e52ef81369ae1b02f1d256eb881bdd7,5b2094af326b7d49268a9f7227214d42d1139080..f0137ad17abbfe4683343e667d5aaf404ec7b799
--- 1/docs/user-guide/index.rst
--- 2/docs/user-guide/index.rst
+++ b/docs/user-guide/index.rst
@@@ -47,8 -31,7 +31,6 @@@ Project-specific User Guide
     opflex-agent-ovs-user-guide
     ovsdb-user-guide
     p4plugin-user-guide
-    packetcable-user-guide
     service-function-chaining
-    snmp-plugin-user-guide
     snmp4sdn-user-guide
 -   uni-manager-plug-in-project
     unified-secure-channel