Add numpy style docs to read_* methods.
Add numpy style docs to read_* methods.

holdenk/sparklingpandas,jhlch/sparklingpandas,holdenk/sparklingpandas,sparklingpandas/sparklingpandas,jhlch/sparklingpandas,michalmonselise/sparklingpandas,michalmonselise/sparklingpandas,sparklingpandas/sparklingpandas