ENH: faceZoneSet: doc. See #2024

etc/caseDicts/annotated/topoSetDict

@@ -103,6 +103,16 @@ actions
         source  boxToCell;
         box     (0.04 0 0)(0.06 100 100);
     }
+
+    // Example: create faceZone from explicit contents. Assumes faceZone same
+    //          orientation as face (flipMap is false)
+    {
+        name    f0;
+        type    faceZoneSet;
+        action  new;
+        source  labelToFace;
+        value   (2);
+    }
 );
 
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