docs: fix broken contributing link (#552)

docs/index.rst

@@ -33,7 +33,7 @@ The rocPRIM documentation is structured as follows:
  * :ref:`iterators` 
  * :ref:`intrinsics` 
 
-To contribute to the documentation refer to `Contributing to ROCm <https://rocm.docs.amd.com/en/latest/contribute/index.html>`_.
+To contribute to the documentation refer to `Contributing to ROCm <https://rocm.docs.amd.com/en/latest/contribute/contributing.html>`_.
 
 You can find licensing information on the `Licensing <https://rocm.docs.amd.com/en/latest/about/license.html>`_ page.