fixed geo accessor example in extending.rst#25420

Merged

TomAugspurger merged 2 commits intopandas-dev:masterfrom

ThibTrip:fixed-docs-extending-example

Feb 25, 2019

Commits on Feb 23, 2019

the method _validate for the geo accessor example now checks presence of substring 'lat' and 'lon' in each column
ThibTrip
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updated issue with "lat" and "lon" in _validate for the geo accessor in extending.rst
ThibTrip
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