DOCS: Fix example links.
DOCS: Fix example links.

The targets for the links should be the html pages, not the rst files.

ahaberlie/MetPy,jrleeman/MetPy,ahill818/MetPy,deeplycloudy/MetPy,dopplershift/MetPy,ahaberlie/MetPy,Unidata/MetPy,dopplershift/MetPy,jrleeman/MetPy,ShawnMurd/MetPy,Unidata/MetPy