[gimp-web/testing] Add mp4 version of the canvas rotation demo, fix a typo

[Alexandre Prokoudine <aprokoudine src gnome org>]

commit be212ac007637cd6a3b160be686951e681efdcac
Author: Alexandre Prokoudine <alexandre prokoudine gmail com>
Date:   Sat Nov 28 03:43:31 2015 +0300

    Add mp4 version of the canvas rotation demo, fix a typo

 content/news/2015-11-26 GIMP 2.9.2.md |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/content/news/2015-11-26 GIMP 2.9.2.md b/content/news/2015-11-26 GIMP 2.9.2.md
index 19a183c..6a6118d 100644
--- a/content/news/2015-11-26 GIMP 2.9.2.md     
+++ b/content/news/2015-11-26 GIMP 2.9.2.md     
@@ -76,7 +76,7 @@ All the experimental tools are subject to performance optimizations, bugfixes, u
 
 ## File Format Support
 
-Thanks to Mukund Sivamaran, Rasmus Hahn, and Øyvind Kolås, GIMP now features basic support for OpenEXR 
files, both loading and exporting. It's currently missing advanced features such as layered or 
multiresolution EXR files, or unpremultiplication when exporting etc., but you should be able to load, 
process, and export a "regular" float point EXR file just fine.
+Thanks to Mukund Sivamaran, Rasmus Hahn, and Øyvind Kolås, GIMP now features basic support for OpenEXR 
files, both loading and exporting. It's currently missing advanced features such as layered or 
multiresolution EXR files, or unpremultiplication when exporting etc., but you should be able to load, 
process, and export a "regular" floating point EXR file just fine.
 
 Additionally, GIMP 2.9.2 features initial support for WebP images, also both loading and exporting. Missing 
features so far are ICC profiles, metadata, and animation.
 
@@ -126,6 +126,7 @@ Apart from the newly added _experimental_ MyPaint Brush tool, there are several
 
 <p><video width="650" height="366" controls>
   <source src="http://download.gimp.org/mirror/pub/gimp/video/v2.9/gimp-canvas-rotation-preview.webm"; 
type="video/webm">
+  <source src="http://download.gimp.org/mirror/pub/gimp/video/v2.9/gimp-canvas-rotation-preview.mp4"; 
type="video/mp4">
 Your browser does not support the video tag.
 </video> </p>