Update developer_setup.rst

Added language for VS Code Python interpreter troubleshooting.

docs/sections/contributor_guide/developer_setup.rst

@@ -31,6 +31,8 @@ Future ``make devshell`` invocations will be almost instantaneous, as the underl
 
 If your development shell misses any functionality you’re used to in your main (``bash``) shell, you can create a ``~/.condevrc`` file, which will be sourced by ``make devshell``, and add desired environment-setup commands to it.
 
+If using an IDE such as VS Code, ensure that the correct Python interpretor, Python 3.12.3 ('DEV-uwtools'), is being used for the environment. In VS Code, this can be changed by using the Command Pallet and searching "Python: Select Interpretor".
+
 Using a ``bash`` Development Shell
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