Merge branch 'catalog/758' into catalog/744

Author: edwardchalstrey1

doc/developer.catalog.rst

@@ -7,6 +7,7 @@ This page covers the process for contributing to and updating Gambit's :ref:`Gam
 To do so, you will need to have the `gambit` GitHub repo cloned and be able to submit pull request via GitHub;
 you may wish to first review the :ref:`contributor guidelines <contributing>`.
 You'll also need to have a developer install of `pygambit` available in your Python environment, see :ref:`build-python`.
+You'll also need to have a developer install of `pygambit` available in your Python environment, see :ref:`build-python`.
 
 You can add games to the catalog saved in a valid representation :ref:`format <file-formats>`.
 Currently supported representations are:
@@ -33,6 +34,7 @@ Add new game files
 
    .. code-block:: bash
 
+       pip install .
        pip install .
        python build_support/catalog/update.py --build