Update index.rst.jinja

Based on comment on astronomy-commons/hats-import#144

python-project-template/{% if include_docs %}docs{% endif %}/index.rst.jinja

@@ -36,7 +36,7 @@ Notes:
    that a set of tests will be run prior to completing a local commit. For more
    information, see the Python Project Template documentation on
    `pre-commit <https://lincc-ppt.readthedocs.io/en/latest/practices/precommit.html>`_.
-3) Install ``pandoc`` allows you to verify that automatic rendering of Jupyter notebooks
+3) Installing ``pandoc`` allows you to verify that automatic rendering of Jupyter notebooks
    into documentation for ReadTheDocs works as expected. For more information, see
    the Python Project Template documentation on
    `Sphinx and Python Notebooks <https://lincc-ppt.readthedocs.io/en/latest/practices/sphinx.html#python-notebooks>`_.