docs(gazelle): Add details about python_root directive. #1782
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While figuring out how to use gazelle with a
src
dir (see #1775) (I figured it out by the way, hence this PR), I noticed that the docs were a little unclear.This PR updates the
gazelle
docs to include details about thepython_root
directive and how to use it.I also fix a the default value for the
python_generation_mode_per_file_include_init
directive, as it was incorrectly listed as "package".