Add a docsref shortcode.

This allows for the build to fail if a reference isn't found.

site/content/docs/4.3/components/popovers.md

@@ -11,8 +11,8 @@ toc: true
 Things to know when using the popover plugin:
 
 - Popovers rely on the 3rd party library [Popper.js](https://popper.js.org/) for positioning. You must include [popper.min.js]({{< param "cdn.popper" >}}) before bootstrap.js or use `bootstrap.bundle.min.js` / `bootstrap.bundle.js` which contains Popper.js in order for popovers to work!
-- Popovers require the [tooltip plugin](/docs/{{< param docs_version >}}/components/tooltips/) as a dependency.
-- If you're building our JavaScript from source, it [requires `util.js`](/docs/{{< param docs_version >}}/getting-started/javascript/#util).
+- Popovers require the [tooltip plugin]({{< docsref "/components/tooltips" >}}) as a dependency.
+- If you're building our JavaScript from source, it [requires `util.js`]({{< docsref "/getting-started/javascript#util" >}}).
 - Popovers are opt-in for performance reasons, so **you must initialize them yourself**.
 - Zero-length `title` and `content` values will never show a popover.
 - Specify `container: 'body'` to avoid rendering problems in more complex components (like our input groups, button groups, etc).
@@ -261,7 +261,7 @@ Note that for security reasons the `sanitize`, `sanitizeFn` and `whiteList` opti
     <tr>
       <td>whiteList</td>
       <td>object</td>
-      <td><a href="/docs/{{< param docs_version >}}/getting-started/javascript/#sanitizer">Default value</a></td>
+      <td><a href="{{< docsref "/getting-started/javascript#sanitizer" >}}">Default value</a></td>
       <td>Object which contains allowed attributes and tags</td>
     </tr>
     <tr>