Update docs for 0.34 (#11540)

* changes to viz docs

* update sql doc images

* expand on line/area/bar settings

* add mongodo variable examples [ci skip]

* in instead of on

Co-Authored-By: Kyle Doherty <kdoh@users.noreply.github.com>

* fix typo

Co-Authored-By: Damon P. Cortesi <d.lifehacker@gmail.com>

* gerunds are a thing

Co-Authored-By: Damon P. Cortesi <d.lifehacker@gmail.com>

* add missing periods