policy: Clarify module package naming
As discussed in the thread starting at https://lists.debian.org/debian-python/2019/11/msg00125.html, it is not always clear to developers what should be done in cases where the module name is not obvious:
- if the name contains underscores or capital letters
- if the name in the PKG-INFO is not the same as the name you import
Clarify this based on what I believe to be current best-practice.
Signed-off-by: Simon McVittie smcv@debian.org
Closes: #945823
Edited by Simon McVittie