Small comment fixes from code review

js/impress.js

@@ -388,7 +388,7 @@
         // `duration` optionally given as second parameter, is the transition duration in css.
         // `reason` is the string "next", "prev" or "goto" (default) and will be made available to
         // preStepLeave plugins.
-        // `origEvent` may contain event that caused the calll to goto, such as a key press event
+        // `origEvent` may contain event that caused the call to goto, such as a key press event
         var goto = function( el, duration, reason, origEvent ) {
             reason = reason || "goto";
             origEvent = origEvent || null;

src/impress.js

@@ -388,7 +388,7 @@
         // `duration` optionally given as second parameter, is the transition duration in css.
         // `reason` is the string "next", "prev" or "goto" (default) and will be made available to
         // preStepLeave plugins.
-        // `origEvent` may contain event that caused the calll to goto, such as a key press event
+        // `origEvent` may contain event that caused the call to goto, such as a key press event
         var goto = function( el, duration, reason, origEvent ) {
             reason = reason || "goto";
             origEvent = origEvent || null;

src/plugins/goto/README.md

@@ -16,6 +16,9 @@ Example:
         <!-- data-goto-key-list and data-goto-next-list allow you to build advanced non-linear navigation. -->
         <div class="step" data-goto-key-list="ArrowUp ArrowDown ArrowRight ArrowLeft" data-goto-next-list="step-4 step-3 step-2 step-5">
 
+See https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key/Key_Values for a table
+of what strings to use for each key.
+
  Author
 ------
 

src/plugins/goto/goto.js

@@ -20,6 +20,9 @@
  *             data-goto-key-list="ArrowUp ArrowDown ArrowRight ArrowLeft"
  *             data-goto-next-list="step-4 step-3 step-2 step-5">
  *
+ * See https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key/Key_Values for a table
+ * of what strings to use for each key.
+ *
  * Copyright 2016-2017 Henrik Ingo (@henrikingo)
  * Released under the MIT license.
  */