SAS class comment mentions inexistant path
`pandas/asv_bench/benchmarks/io/sas.py` :

> class SAS:
> 
>     params = ["sas7bdat", "xport"]
>     param_names = ["format"]
> 
>     def setup(self, format):
>         # Read files that are located in 'pandas/io/tests/sas/data'

However, the files are in  'pandas/tests/io/sas/data'.

EDIT:
unrelated typo: there's lots of places in the codebase that use "rather then" instead of "rather than". As this is also a minor typo that doesn't affect any code, I think it'd be OK to address both in the same pull request