DOC: Remove incorrect line in README

If locating fails, an error will be given. Currently, the user is only
prompted if function-specific and only when the prefix argument is
given.
TODO: Update
MNT: Correct typo in docstring
DOC: Reformat README
DOC: Remove TOC from README
DOC: Mention a few other functions in README
MNT: Reword a few docstrings