DOC: Fixing typo in cluster.vq.vq docstring
DOC: graphical example for cwt

and use a more interesting signal
Merge pull request #3526 from endolith/patch-3

DOC: graphical example for cwt, and use a more interesting signal
Merge pull request #3519 from ankit-maverick/minor-doc-fix

DOC: Fixing typo in cluster.vq.vq docstring