Dead header "Ordered columns" still present in docs. Seemingly superseded by "Validating the order of the columns"

[blakeNaccarato]

Location of the documentation

https://pandera.readthedocs.io/en/latest/dataframe_schemas.html#ordered-columns

Documentation problem

Dead header, seemingly superseded by:

https://pandera.readthedocs.io/en/latest/dataframe_schemas.html#validating-the-order-of-the-columns

Suggested fix for documentation

Remove the dead header and update any refs.