1.4.0
DOC: add note about restarting conda environment after creation (#27387)
DOC fix wrong indentations in the documentation that lead to undesired blockquotes (#28107)
DOC clarifies description of Transformer API (#27901)
DOC Add a 'Cython Best Practices, Conventions and Knowledge' section (#25608)
REL Update what's new and index for 1.4.0 final (#28148)
DOC: fix a typo in the link to the User Guide (#27784)
DOC fixes intersphinx warnings (#26779)