Bug 572924: "Enable SWT reporting of non-disposed resources" pref docs

Includes adding some cross-referencing and more documentation on
-Dorg.eclipse.swt.graphics.Resource.reportNonDisposed

Change-Id: Ica75d5d61919b2391fb2831264d68637b02ee3f9
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.common/+/179889
Reviewed-by: Matthias Becker <ma.becker@sap.com>
Reviewed-by: Julian Honnen <julian.honnen@vector.com>
Tested-by: Julian Honnen <julian.honnen@vector.com>