Merge pull request statsmodels#9364 from statsmodels/0.14.3-rel-note

DOC: Spelling

Merge pull request statsmodels#9213 from bashtage/rls-0.14.2-final

DOC: Final docs for 0.14.2

Merge pull request statsmodels#9092 from bashtage/backport-0.14.1

Backport 0.14.1

DEV: Tag start of release 0.15

Merge pull request statsmodels#8866 from bashtage/doc-admonitions

DOC: Add admonitions for changes and deprecations

Merge pull request statsmodels#8839 from bashtage/sphinx-immaterial

DOC: Final changes for 0.14.0rc0 notes

Merge pull request statsmodels#8501 from bashtage/final-docs-0.13.5

DOC: Add release notes for .4 and .5

Merge pull request statsmodels#8492 from statsmodels/pins

MAINT: Refine pins

Merge pull request statsmodels#8493 from statsmodels/final-docs

DOC: Final 0.13.3 docs

Merge pull request statsmodels#8107 from bashtage/release-note

MAINT: Release note for 0.13.2