Add link to microtask_guide (#2815)

Related: #1584

files/en-us/web/javascript/reference/global_objects/promise/index.html

@@ -73,7 +73,7 @@ <h3 id="Chained_Promises">Chained Promises</h3>
 .catch(handleRejectedAny);
 </pre>
 
-<p>Using <code>{{JSxRef("Functions.arrow_functions", "Arrow Function Expressions")}}</code> for the callback functions, an implementation of a promise chain might look something like this:</p>
+<p>Using <code>{{JSxRef("Functions/Arrow_functions", "Arrow Function Expressions")}}</code> for the callback functions, an implementation of a promise chain might look something like this:</p>
 
 <pre class="brush: js">
 promise1
@@ -211,7 +211,7 @@ <h2 id="Static_methods">Static methods</h2>
 </dl>
 
 <h2 id="Instance_methods">Instance methods</h2>
-
+<p>See the <a target="_blank" href="/en-US/docs/Web/API/HTML_DOM_API/Microtask_guide" title="Microtask_guide">Microtask guide</a> to learn more about how these methods use the Microtask queue and services.</p>
 <dl>
  <dt>{{jsxref("Promise.prototype.catch()")}}</dt>
  <dd>Appends a rejection handler callback to the promise, and returns a new promise resolving to the return value of the callback if it is called, or to its original fulfillment value if the promise is instead fulfilled.</dd>