docs: Small changes to plugin, updated the requirements

Change-Id: I3c05a28991d01e726d4fa8580a720359a2d4ce91
Signed-off-by: jdenisco <jdenisco@cisco.com>
diff --git a/docs/gettingstarted/developers/index.rst b/docs/gettingstarted/developers/index.rst
index 3520ed3..525f1b7 100644
--- a/docs/gettingstarted/developers/index.rst
+++ b/docs/gettingstarted/developers/index.rst
@@ -21,6 +21,7 @@
    building
    running_vpp
    gdb_examples
+   add_plugin
    gitreview
    softwarearchitecture
    infrastructure
@@ -34,5 +35,4 @@
    binary_api_support
    buildsystem/index.rst
    eventviewer
-   add_plugin
    fib20/index.rst