Revert parts of b24c368d103c2e6e5b9de87b72f323a35dd9dd73 from bug 288521
to restore the description of how to add branding when doing the RCP
application cheatsheet.

Change-Id: I570f9ed08b189b6b9e5c0d0b2de862de1d1d6147
Signed-off-by: Michael Keppler <Michael.Keppler@gmx.de>
Reviewed-on: https://git.eclipse.org/r/c/pde/eclipse.pde.ui/+/144165
Tested-by: PDE Bot <pde-bot@eclipse.org>
Reviewed-by: Lars Vogel <Lars.Vogel@vogella.com>