MFC: r264460
MFC: r264460

Document the xdev* targets.

PR:		188519
Submitted by:	Idwer Vollering <vidwer at gmail.com>
Reviewed by:	bapt

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase