docs: clarify usage of version files #1069
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I found the current discussion around version files somewhat confusing.
When you're reading the usage guide, the second point is telling you to make a version file; strongly implying you should. But in reality, you most likely do not need to bother with keeping a specific version file. Explain more clearly about the implications of this.
Under this is a section on using
python -m setuptools_scm --help
which seems like an orphan from the "as a cli" section; move it down there.The runtime section starts by telling you what is strongly discouraged without explaination why. Make it clearer by giving the first example as the most supported thing, which is using standard importlib; then briefly discuss the version file from above, explaining what's in it for a standard Python template, then the strongly discouraged direct import method.
In the config doc, update to discuss
importlib
for consistency.Correct some capitalization and other minor formatting bits while we're here.