[L] Change in pysim[master]: docs: auto-generate Card Filesystem Reference

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fixeria has posted comments on this change by fixeria. ( https://gerrit.osmocom.org/c/pysim/+/42551?usp=email )

Change subject: docs: auto-generate Card Filesystem Reference ......................................................................

Patch Set 3:

(1 comment)

File docs/pysim_fs_sphinx.py:

https://gerrit.osmocom.org/c/pysim/+/42551/comment/6533af5c_8d3730ed?usp=ema... : PS1, Line 57: 'pySim.sysmocom_sja2', 'DF_SYSTEM'),

if we manually need to maintain this list here (which is error-prone) I think we should find a way h […]

Good idea. I have added a unit test that catches missing entries. Tested manually by removing items from `SECTIONS[]` - seems to work.