Fix typo in UiBinder example; uiBinder → binder

Bug: issue 8983
Change-Id: I9237468d1eead144956942b0d0bf7a7c97804c2b
diff --git a/src/main/markdown/doc/latest/DevGuideUiBinder.md b/src/main/markdown/doc/latest/DevGuideUiBinder.md
index 7ced0ba..f957d4d 100644
--- a/src/main/markdown/doc/latest/DevGuideUiBinder.md
+++ b/src/main/markdown/doc/latest/DevGuideUiBinder.md
@@ -862,7 +862,7 @@
   }
 
   protected FooPickerDisplay(UiBinder<Widget, FooPickerDisplay> binder) {
-    initWidget(uiBinder.createAndBindUi(this));
+    initWidget(binder.createAndBindUi(this));
   }
 
   public static FooPickerDisplay createRedPicker() {