Fix further Sphinx build warnings

Author: felicitymay

docs/codeql/codeql-cli/publishing-and-using-codeql-packs.rst

@@ -1,4 +1,4 @@
-.. publishing-and-using-codeql-packs:
+.. _publishing-and-using-codeql-packs:
 
 Publishing and using CodeQL packs
 =================================
@@ -16,6 +16,8 @@ Configuring the ``qlpack.yml`` file before publishing
 
 You can check and modify the configuration details of your CodeQL pack prior to publishing. Open the ``qlpack.yml`` file in your preferred text editor.
 
+.. code-block:: none
+
    library: # set to true if the pack is a library. Set to false or omit for a query pack
    name: <scope>/<pack>
    version: x.x.x