Improve models documentation

[yakky]

Clarify that description is not available in the list responses

References

Fix #105

Checklist

• [x] I have read the contribution guide
• [x] Code lint checked via inv lint
• [x] changes file included (see docs)
• [x] Usage documentation added in case of new features
• [ ] Tests added

[codecov[bot]]

Codecov Report

Merging #120 (2791da7) into master (f448eda) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #120   +/-   ##
=======================================
  Coverage   96.34%   96.34%           
=======================================
  Files           8        8           
  Lines         876      876           
  Branches       63       63           
=======================================
  Hits          844      844           
  Misses         19       19           
  Partials       13       13           

Flag	Coverage Δ
unittests	96.34% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
taiga/models/base.py	100.00% <ø> (ø)
taiga/models/models.py	96.43% <ø> (ø)

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[coveralls]

Coverage increased (+0.007%) to 97.831% when pulling 2791da70873d2cd26b92f83ea5641ea38fa4a774 on bugfix/issue-105-description-docs into f448edabe872e2eb295550d75a1267a0c8f27a40 on master.