VOL-4840 - docs.voltha.org edits

Makefile
patches/python_310_migration.sh
-------------------------------
   o Change log message to note venv patching by version.
   o Original message could be interpreted as explict patching of wrong version.

makefiles/lint/include.mk
-------------------------
   o Document lint targets: usage, commands, makefiles, etc.

Change-Id: I895a0a032f856632c9adf31aa634b6cbf0328cdb
diff --git a/index.rst b/index.rst
index 5ca5eaf..eae1574 100644
--- a/index.rst
+++ b/index.rst
@@ -208,3 +208,8 @@
    :caption: HOWTO Topics
 
    howto/index
+
+.. toctree::
+   :maxdepth: 0
+
+   howto/eof