docs: typo in "Working with Sections"

[adustinsky]

In the web page: https://python-docx.readthedocs.org/en/latest/user/sections.html
a sample code has a mistake in writing:

Adding a new section
The Document.add_section() method allows a new section to be started at the end of the document. Paragraphs and tables added after calling this method will appear in the new section:

current_section = document.section[-1] # last section in document

Here, the "section[-1] " shoule be " sections[-1] ".

[scanny]

Thanks @adustinsky, this is fixed and will go out with the upcoming release :)