Clean up docs issues

The Sphinx build produces a number of warnings and errors. Some are
rightfully ignored, but many need to be fixed. These are mostly
unindexed pages and misformatted references.

Signed-off-by: Eric Ball <eball@linuxfoundation.org>
Change-Id: I9d7a116dc87083ad2dcab20e31cd479364f298cd
diff --git a/howto/release/components/index.rst b/howto/release/components/index.rst
index 7001c48..54c537f 100644
--- a/howto/release/components/index.rst
+++ b/howto/release/components/index.rst
@@ -6,6 +6,7 @@
 
    igmpproxy/index
    kafka/index
+   kafka-onos/index
    maclearner/index
    mcast/index
    olt/index