sketch out parts of 'whole ui' eval viz pipeline build stage; fix copypaste issue with string viz

src/df/core/df_core.mdesk

@@ -462,6 +462,13 @@ DF_CoreCmdTable://               |            |                  |
 //                          rows, this stage offers the ability to build a ui
 //                          stretching over all of the rows.
 //
+// whole ui build, "wu"  -> sometimes, more sophisticated interfaces need to be
+//                          provided for a view rule, that stretch beyond the
+//                          limits of what could be offered inside a watch
+//                          window block. in such cases, the eval/view-rule
+//                          combo will be granted its own tab for example, and
+//                          this stage is used to fill such a ui.
+//
 // A few other bits are included for various ways in which a view rule may be
 // applied throughout the eval visualization pipeline. A list follows:
 //