JsonWizard: Document historyId and restoreLastHistoryItem

Change-Id: I5f06fb06cb6766f2f9899bfd2aeadc2198dab1c7
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

doc/qtcreator/src/projects/creator-only/creator-projects-custom-wizards-json.qdocinc

@@ -785,7 +785,9 @@
         "data":
         {
             "trText": "%{BaseCB}",
-            "trDisabledText": "%{BaseCB}"
+            "trDisabledText": "%{BaseCB}",
+            "historyId": "EditValues",
+            "restoreLastHistoryItem": false
         }
     },
     \endcode
@@ -808,6 +810,14 @@
         \li \c isPassword is a boolean value that specifies that the line edit
             contains a password, which will be masked.
 
+        \li \c historyId is a key that specifies the name for a list of items
+            for the history completer.
+
+        \li \c restoreLastHistoryItem is a boolean that specifies that the
+            last history item is automatically set as the default text in
+            the line edit. This key can only be set to true if \c historyId
+            is also set.
+
     \endlist
 
     \section2 Path Chooser