docs(CHANGELOG.md): add missing breaking changes from #16476

Closes #16556

CHANGELOG.md

@@ -25,10 +25,12 @@
   [#15597](https://github.com/angular/angular.js/issues/15597))
 - **$interval:** throw when trying to cancel non-$interval promise
   ([a8bef9](https://github.com/angular/angular.js/commit/a8bef95127775d83d80daa4617c33227c4b443d4),
+  [#16424](https://github.com/angular/angular.js/issues/16424),
   [#16476](https://github.com/angular/angular.js/issues/16476))
 - **$timeout:** throw when trying to cancel non-$timeout promise
   ([336525](https://github.com/angular/angular.js/commit/3365256502344970f86355d3ace1cb4251ae9828),
-  [#16424](https://github.com/angular/angular.js/issues/16424))
+  [#16424](https://github.com/angular/angular.js/issues/16424),
+  [#16476](https://github.com/angular/angular.js/issues/16476))
 - **$cookies:** remove the deprecated $cookieStore factory
   ([73c646](https://github.com/angular/angular.js/commit/73c6467f1468353215dc689c019ed83aa4993c77),
   [#16465](https://github.com/angular/angular.js/issues/16465))
@@ -727,7 +729,7 @@ angular.module('myModule', []).config(function($controllerProvider) {
 ```
 
 ### **$rootScope** due to:
-  - **([c2b8fa](https://github.com/angular/angular.js/commit/c2b8fab0a480204374d561d6b9b3d47347ac5570))**: provide correct value of one-time bindings in watchGroup
+  - **[c2b8fa](https://github.com/angular/angular.js/commit/c2b8fab0a480204374d561d6b9b3d47347ac5570)**: provide correct value of one-time bindings in watchGroup
 
 Previously when using `$watchGroup` the entries in `newValues` and
 `oldValues` represented the *most recent change of each entry*.
@@ -777,6 +779,59 @@ Where now the `oldValue` will always equal the previous `newValue`:
 |  `b=2`   | [1, 2] | [1, undefined] |
 |  `a=b=3` | [3, 2] | [1, 2] |
 
+### **$interval** due to:
+  - **[a8bef9](https://github.com/angular/angular.js/commit/a8bef95127775d83d80daa4617c33227c4b443d4)**: throw when trying to cancel non-$interval promise
+
+`$interval.cancel()` will throw an error if called with a promise that
+was not generated by `$interval()`. Previously, it would silently do
+nothing.
+
+Before:
+```js
+var promise = $interval(doSomething, 1000, 5).then(doSomethingElse);
+$interval.cancel(promise);  // No error; interval NOT canceled.
+```
+
+After:
+```js
+var promise = $interval(doSomething, 1000, 5).then(doSomethingElse);
+$interval.cancel(promise);  // Throws error.
+```
+
+Correct usage:
+```js
+var promise = $interval(doSomething, 1000, 5);
+var newPromise = promise.then(doSomethingElse);
+$interval.cancel(promise);  // Interval canceled.
+```
+
+### **$timeout** due to:
+  - **[336525](https://github.com/angular/angular.js/commit/3365256502344970f86355d3ace1cb4251ae9828)**: throw when trying to cancel non-$timeout promise
+
+`$timeout.cancel()` will throw an error if called with a promise that
+was not generated by `$timeout()`. Previously, it would silently do
+nothing.
+
+Before:
+```js
+var promise = $timeout(doSomething, 1000).then(doSomethingElse);
+$timeout.cancel(promise);  // No error; timeout NOT canceled.
+```
+
+After:
+```js
+var promise = $timeout(doSomething, 1000).then(doSomethingElse);
+$timeout.cancel(promise);  // Throws error.
+```
+
+Correct usage:
+```js
+var promise = $timeout(doSomething, 1000);
+var newPromise = promise.then(doSomethingElse);
+$timeout.cancel(promise);  // Timeout canceled.
+```
+
+
 <a name="1.6.10"></a>
 # 1.6.10 crystalline-persuasion (2018-04-17)