docs(*): fix its vs it's typos.

Only use the apostrophe if you can expand "it's" to "it is" and
still have a grammatical phrase.

src/ngAnimate/animate.js

@@ -708,7 +708,7 @@ angular.module('ngAnimate', ['ng'])
            * @function
            * @description Adds and/or removes the given CSS classes to and from the element.
            * Once complete, the done() callback will be fired (if provided).
-           * @param {DOMElement} element the element which will it's CSS classes changed
+           * @param {DOMElement} element the element which will its CSS classes changed
            *   removed from it
            * @param {string} add the CSS classes which will be added to the element
            * @param {string} remove the CSS class which will be removed from the element

src/ngScenario/Future.js

@@ -38,7 +38,7 @@ angular.scenario.Future.prototype.execute = function(doneFn) {
 };
 
 /**
- * Configures the future to convert it's final with a function fn(value)
+ * Configures the future to convert its final with a function fn(value)
  *
  * @param {function()} fn function(value) that returns the parsed value
  */
@@ -48,7 +48,7 @@ angular.scenario.Future.prototype.parsedWith = function(fn) {
 };
 
 /**
- * Configures the future to parse it's final value from JSON
+ * Configures the future to parse its final value from JSON
  * into objects.
  */
 angular.scenario.Future.prototype.fromJson = function() {
@@ -56,7 +56,7 @@ angular.scenario.Future.prototype.fromJson = function() {
 };
 
 /**
- * Configures the future to convert it's final value from objects
+ * Configures the future to convert its final value from objects
  * into JSON.
  */
 angular.scenario.Future.prototype.toJson = function() {