DOC - docstring, whitespace formatting
DOC - docstring, whitespace formatting

And added helpful (to me) import lines in docstring

alexis-roche/nipy,arokem/nipy,arokem/nipy,alexis-roche/niseg,nipy/nireg,arokem/nipy,nipy/nipy-labs,bthirion/nipy,alexis-roche/nipy,alexis-roche/register,alexis-roche/niseg,nipy/nipy-labs,arokem/nipy,alexis-roche/nipy,alexis-roche/nireg,alexis-roche/nipy,bthirion/nipy,alexis-roche/register,nipy/nireg,bthirion/nipy,bthirion/nipy,alexis-roche/register,alexis-roche/nireg