Invalid '@appSection' element selector used in sections code sample

[senocular]

appSection is used as a variable within the test code but then also used incorrectly as an element selector in the following click() command when there is no @appSection defined in elements.

https://github.com/nightwatchjs/nightwatch-docs/blame/fb8074209ecd41eb36cde1bd8f712b718dc87a72/guide/working-with-page-objects/po-sections.md#L103

I didn't go so far as to figure out what exactly needed to be clicked...