Documentation: Mention panel position

[theking2]

Currently in the documentation there is no metion of:

• View: set Panel Alignment to Justify
• View: set Panel Alignment to Center
• View: set Panel Alignment to Left
• View: set Panel Alignment to Right

Or the richt-click menu of the terminal panel:

It would be a helpful addition to the documentation.

[ntrogh]

Closed as documented here: https://code.visualstudio.com/docs/configure/custom-layout#_panel-alignment