Fix: Abstract models should not show 'database table' string in rendered documentation

[insspb]

This fixes issue, raised by me in #39

It also rename database model related options, and add few other.

fixes #39

[insspb]

@timoludwig, please take a look. I am plan to add few more pull request on things, that bothers me.

But as all of them related to model generation, I do not want to add all at once, to exclude merge conflicts.

[codecov-commenter]

Codecov Report

Merging #40 (89edbac) into main (955853e) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 89edbac differs from pull request most recent head 2f0a76b. Consider uploading reports for the commit 2f0a76b to get more accurate results

@@            Coverage Diff            @@
##              main       #40   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           10        10           
  Lines          308       314    +6     
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+ Hits           308       314    +6     

Impacted Files	Coverage Δ
sphinxcontrib_django/docstrings/__init__.py	100.00% <100.00%> (ø)
sphinxcontrib_django/docstrings/classes.py	100.00% <100.00%> (ø)

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[timobrembeck]

Hi @insspb,
Thanks a lot for your support and your motivation to add more contributions in the future 💪

I agree with the point of the issue and like the solution, however I would prefer a simpler approach and think the custom placeholders are not really necessary, if that's ok with you?

[insspb]

@timoludwig I removed django_tables_names_abstract_name option.
Second PR (#42) fixed too.

[timobrembeck]

@insspb Thanks a lot for your changes and sorry for the delay!

I reverted your renaming of the config variable to allow backward compatibility and added a changelog entry, but other than that it looks good! 👍