DOC : list type option in tensordot axes arg
DOC : do not abuse enumeration for return types

change '{ndarray, float}' -> 'ndarray or float' as {} are for
when the value is an enumeration
DOC : move shape to front to match rest of docs
DOC : do not abuse enum markup

 - {ndarray, bool} -> ndarray or bool
 - {int, array of ints} -> int or array of ints
 - {str, function} -> str or function
 - {sequnce, int} -> sequence or int
 - {array_like, poly1d} -> array_like or poly1d
 - {None, list of `m` scalars, scalar} -> list of `m` scalars or scalar
DOC : integer -> int doc nitpick
DOC : added missing space in frexp docstring
DOC : optional parenthesis
Merge pull request #5368 from tacaswell/sundry_doc_changes

Cleanups in documentation formatting.