docs: Improve & link cnat doc

Type: docs

Change-Id: Ib985ed6a644ae3f4c330bf6a27dc69c49a489a2f
Signed-off-by: Nathan Skrzypczak <nathan.skrzypczak@gmail.com>
diff --git a/docs/gettingstarted/developers/index.rst b/docs/gettingstarted/developers/index.rst
index 93f4e33..378b9fb 100644
--- a/docs/gettingstarted/developers/index.rst
+++ b/docs/gettingstarted/developers/index.rst
@@ -41,3 +41,4 @@
    punt
    quic_plugin
    cross_compile_macos.rst
+   cnat