FEM: examples, prescribed displacement, add comment in the regard of z88

src/Mod/Fem/femexamples/ccx_cantilever_prescribeddisplacement.py

@@ -61,6 +61,8 @@ def setup(doc=None, solvertype="ccxtools"):
     # apply a prescribed displacement of 250 mm in -z on the front end face
 
     if solvertype == "z88":
+        # constraint displacement is not supported for Z88
+        # pass a not valid solver name for z88, thus no solver is created
         solvertype = "z88_not_valid"
 
     doc = setup_cantileverbase(doc, solvertype)