shiny/example/widgetgallery: rename gallery to widgetgallery.

There's now also an example/icongallery.

Change-Id: Id677877a76d1d529c377d52385d643597badaf08
Reviewed-on: https://go-review.googlesource.com/31590
Reviewed-by: David Crawshaw <crawshaw@golang.org>
diff --git a/shiny/example/gallery/main.go b/shiny/example/widgetgallery/main.go
similarity index 96%
rename from shiny/example/gallery/main.go
rename to shiny/example/widgetgallery/main.go
index 5cb247f..17e8844 100644
--- a/shiny/example/gallery/main.go
+++ b/shiny/example/widgetgallery/main.go
@@ -8,7 +8,7 @@
 // install this example program. Use "go run main.go" to run it or "go install
 // -tags=example" to install it.
 
-// Gallery demonstrates the shiny/widget package.
+// Widgetgallery exhibits the shiny/widget package's widget set.
 package main
 
 import (