Add notice that environment python version does not satisfy project.requires-python

[btruhand]

I stumbled upon this when tweaking my pyproject.toml where the python version is 3.10 and my project.requires-python is 3.11. I didn't catch this at first in the documentation. Specifically:

The resolvers will be based on the [python-sources option](https://hatch.pypa.io/latest/plugins/environment/virtual/#options) and all resolved interpreters will ensure compatibility with the project's defined [Python support](https://hatch.pypa.io/latest/config/metadata/#python-support).

When creating the environment with this kind of setup for the first time, a user will get the following error:

RuntimeError: failed to find interpreter for Builtin discover of python_spec='None'. Which comes from virtualenv.

For the uninitiated the error message is not very informative. I traced back how Hatch passes in python_spec and looks like Hatch is aware when env.python < project.requires-python by explicitly passing in None. So, it should be possible for Hatch to exit early without having to call virtualenv and output a more tailored error message for this situation