docs : intro : fix -ms- vendor prefix

_posts/docs/2010-12-01-introduction.mdown

@@ -120,7 +120,7 @@ Add these styles to your CSS for [filtering](filtering.html), [animation](animat
 .isotope .isotope-item {
   -webkit-transition-property: -webkit-transform, opacity;
      -moz-transition-property:    -moz-transform, opacity;
-      -ms-transition-property:    -moz-transform, opacity;
+      -ms-transition-property:     -ms-transform, opacity;
        -o-transition-property:         top, left, opacity;
           transition-property:         transform, opacity;
 }