Typo corrections, I avoided making changes to words that have regional spelling differences.

platform/features/layout/src/FixedDragHandle.js

@@ -94,7 +94,7 @@ define(
         };
 
         /**
-         * End a drag gesture. This should be callled when a drag
+         * End a drag gesture. This should be called when a drag
          * concludes to trigger commit of changes.
          */
         FixedDragHandle.prototype.endDrag = function () {

platform/features/layout/src/LayoutController.js

@@ -152,7 +152,7 @@ define(
         }
 
         // Convert from { positions: ..., dimensions: ... } to an
-        // apropriate ng-style argument, to position frames.
+        // appropriate ng-style argument, to position frames.
         LayoutController.prototype.convertPosition = function (raw) {
             var gridSize = this.gridSize;
             // Multiply position/dimensions by grid size