Update docs

Author: tolyo

docs/content/docs/directive/el.md

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+---
+title: ng-el
+description: >
+  Reference to an element
+---
+
+### Description
+
+The `ng-el` directive allows you to store a reference to a DOM element in the
+current `scope`, making it accessible elsewhere in your template or from your
+controller. The reference is automatically removed if the element is removed
+from the DOM.
+
+### Parameters
+
+---
+
+#### `ng-el`
+
+- **Type:** `string` (optional)
+- **Description:** Name of the key under which the element will be stored in
+  `scope`. If omitted, the element’s `id` attribute will be used.
+- **Example:**
+
+  ```html
+  <div id="box" ng-el="$box"></div>
+  ```
+
+---
+
+### Demo
+
+{{< showhtml src="examples/ng-el/ng-el.html" >}}
+{{< showraw src="examples/ng-el/ng-el.html" >}}
+
+---

docs/static/examples/ng-el/ng-el.html

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+<section ng-app>
+  <div ng-el="$item"></div>
+  <div ng-el id="description"></div>
+  <button
+    class="btn"
+    ng-click="$item.innerHTML = '🐱'; description.innerHTML='The cat has been inserted'"
+  >
+    Insert a cat
+  </button>
+</section>