chore(docs): Add a comment about why `view.logView` is done in app.js
chore(docs): Add a comment about why `view.logView` is done in app.js

I had to dig deep to remember why `view.logView` is done in app.js
instead of in the view's render function - it's because of the settings
page and child views. If the view took care of logging itself, each
child view would log that it was visible at the same time.

https://github.com/mozilla/fxa-content-server/pull/4441

r=philbooth
shane-tomlinson/fxa-content-server,mozilla/fxa-content-server,mozilla/fxa-content-server,shane-tomlinson/fxa-content-server,mozilla/fxa-content-server,shane-tomlinson/fxa-content-server