Merge pull request #1074 from UncleGrumpy/docs_toc_fix

Fix error in documentation table of contents

One file was missed during the recent documentation updates. This fixes the
table of contents to match links changed in other updates, including the link
to the no longer duplicated doxygen html content.

These changes are made under both the "Apache 2.0" and the "GNU Lesser General
Public License 2.1 or later" license terms (dual license).

SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later

doc/src/api-reference-documentation.rst

@@ -2,7 +2,6 @@
 ..
 .. SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later
 
-
 API Reference Documentation
 =========================================
 
@@ -54,12 +53,10 @@ etest
    apidocs/erlang/etest/*
 
 =========================================
-AtomVM 'C' Internal Libraries
+AtomVM 'C' APIs
 =========================================
 
 .. toctree::
    :maxdepth: 1
 
-   c_api_docs
-
-[`libAtomVM  (Doxygen theme) <_static/libatomvm/index.html>`_]
+   apidocs/libatomvm/index