Applying the "next_paragraph_style" attribute

[jf20191031]

Dear Contributors,

I was going to use the newt_paragraph_style property in a document build entirely with the python-docx module but I could not succeed. I have already found a proper answer to my question here:
#299 (comment)

This setting isn't operative in python-docx, only in Word. If you want to add a following paragraph in python-docx, you'll need to set it to the style you want yourself.

I would only ask you to refer to this information in the documentation as well because it may be not evident for other users too.

Thanks for this excellent module!

Best regards
József