Update contributing guide.

CONTRIBUTING.rst

@@ -17,17 +17,16 @@ Install ``pre-commit`` with ``pip`` and install the git hook:
 Coding style
 --------------
 
-`Yapf <https://github.com/google/yapf>`_ is used for code formatting, and `isort <https://timothycrosley.github.io/isort/>`_ is used to sort imports.
+`yapf-isort <https://pypi.org/project/yapf-isort/>`_ is used for code formatting.
 
-``yapf`` and ``isort`` can be run manually via ``pre-commit``:
+It can be run manually via ``pre-commit``:
 
 .. code-block:: bash
 
-	$ pre-commit run yapf -a
-	$ pre-commit run isort -a
+	$ pre-commit run yapf-isort -a
 
 
-The complete autoformatting suite can be run with ``pre-commit``:
+Or, to run the complete autoformatting suite:
 
 .. code-block:: bash
 

doc-source/contributing.rst

@@ -16,17 +16,16 @@ Install ``pre-commit`` with ``pip`` and install the git hook:
 Coding style
 --------------
 
-`Yapf <https://github.com/google/yapf>`_ is used for code formatting, and `isort <https://timothycrosley.github.io/isort/>`_ is used to sort imports.
+`yapf-isort <https://pypi.org/project/yapf-isort/>`_ is used for code formatting.
 
-``yapf`` and ``isort`` can be run manually via ``pre-commit``:
+It can be run manually via ``pre-commit``:
 
 .. prompt:: bash
 
-	pre-commit run yapf -a
-	pre-commit run isort -a
+	pre-commit run yapf-isort -a
 
 
-The complete autoformatting suite can be run with ``pre-commit``:
+Or, to run the complete autoformatting suite:
 
 .. prompt:: bash