DOC: minor fix in extract docstring
DOC: tweaks
DOC: tweak ecosystem section
DOC: tweak ecosystem section
DOC: tweak ecosystem section
DOC: tweak ecosystem section
Merge pull request #5838 from danielballan/extract-docstring

DOC: minor fix in extract docstring
BUG: Bug in selection with missing values via .ix from a duplicate indexed DataFrame failing (GH5835)