[Documentation] v-app-bar doesn't mention anything about being required to be inside v-app

[redwyre]

Environment

OS: Windows 10 (current)

Steps to reproduce

1. Try to add v-app-bar
2. Get injection "Symbol(vuetify:layout)" not found error
3. Google error to find out you need to put wrap in it v-app

Expected Behavior

Mention v-app

Actual Behavior

Not mentioned

Reproduction Link