Merge pull request #12957 from BBosman/rename-mixin

Fix transition-timing-function mixin

less/mixins.less

@@ -152,8 +152,8 @@
 
 // Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)
 .transition-timing-function(@timing-function) {
-  -webkit-animation-timing-function: @timing-function;
-          animation-timing-function: @timing-function;
+  -webkit-transition-timing-function: @timing-function;
+          transition-timing-function: @timing-function;
 }
 
 // Deprecated as of v3.2.0 due to the introduction of autoprefixer (will be removed in v4)