Describe the issue linked to the documentation

In the documentation for CountVectorizer stop_words replacement with max_df, max_df is suggested to have bounds [0.7, 1.0).

But, the documentation for max_df allows bounds from 0 to 1.

This seems a little strange! Is the 0.7 suggested to stop the user from doing crazy things with max_df? Or is this old?

Suggest a potential alternative/fix

Should there be consistency?