Tweak contributing guide wording

docs/source/contributing.rst

@@ -44,9 +44,10 @@ Development Environment
 
 To set up your development environment:
 
-1. Create and activate a Python 3.8 virtual environment using your preferred
-   tool. We maintain compatibility with Python 3.8 and above, so developing
-   using 3.8 locally will ensure your contributions are compatible.
+1. Create and activate a Python virtual environment using your preferred tool.
+   We maintain compatibility with Python 3.8 and above, so developing using
+   version 3.8 locally should ensure that your contributions are compatible
+   with all supported Python versions.
 2. Run ``make develop`` from the top level of the repository. This command will
    install (using ``pip``) all packages required to run the unit tests, run the
    doc tests, and build the sphinx documentation. It will also install