DOC fix intend in docstring (LATEX Error)
DOC fix docstring model, wald_test, f_test, t_test, ContrastResults
DOC: add Summary, docstrings misc improvements
DOC: genmod cross-links, empty lines
DOC: GEE cross-links
Unindent 'hasconst' parameter heading in models doc closes #1656
DOC FIX fix extra params docstring, closes #1656 (previous commit didn't work)
DOC: formatting and add offset, exposure to discrete model docstring see #1817
DOC: add Poisson.fit_regularized.__doc__  [ci skip]
Merge pull request #1819 from josef-pkt/docwork

DOC Docwork
BUG: revert change to conf_int in PR #1819
Merge pull request #1820 from josef-pkt/fix_confint

BUG: revert change to conf_int in PR #1819
Added missing offset to starting value calculation
Rename eta to lin_pred
Docstring edits
Close second part of issue #1720
Rename Y as endog
Handle maxiter=0 as a special case
Added _offset_exposure to _data_attr (but still fails in test_shrink_pickle)
Increase pickle size limit (was failing on GLM)