Add makefile targets for doc8 lint, fix formatting/spelling issues

Change-Id: I0f45ffe0ba94fab89f9b38c9b73ed7b9091f1795
diff --git a/docs/source/olt-state-machine.rst b/docs/source/olt-state-machine.rst
index d92d6f8..e40774a 100644
--- a/docs/source/olt-state-machine.rst
+++ b/docs/source/olt-state-machine.rst
@@ -39,4 +39,5 @@
         created -> initialized -> enabled -> disabled -> deleted
         disabled -> enabled
         deleted -> initialized
-    }
\ No newline at end of file
+    }
+