fix: use backtick code blocks instead of highlight blocks, since template vars didn't work in those

PouchDB version number was not interpolated in the code examples for the CDN link.

Author: espy

docs/download.md

@@ -8,12 +8,12 @@ Apache PouchDB™ is an open-source JavaScript database inspired by <a href="htt
 
 {% include anchor.html class="h3" title="Quick Start" hash="file" %}
 
-{% highlight html %}
+```html
 <script src="https://cdn.jsdelivr.net/npm/pouchdb@{{site.version}}/dist/pouchdb.min.js"></script>
 <script>
   const db = new PouchDB('my_database');
 </script>
-{% endhighlight %}
+```
 
 PouchDB can also be directly downloaded:
 

docs/getting-started.md

@@ -40,11 +40,11 @@ It's also a good idea to open your browser's console so you can see any errors o
 
 Open `index.html` and include PouchDB in the app by adding a script tag:
 
-{% highlight html %}
+```html
 <script src="https://cdn.jsdelivr.net/npm/pouchdb@{{site.version}}/dist/pouchdb.min.js"></script>
 <script src="js/base.js"></script>
 <script src="js/app.js"></script>
-{% endhighlight %}
+```
 
 PouchDB is now installed in your app and ready to use! (In production, you should use a local copy of the script.)