Add code example to font (#287)

Author: fmerian

settings/global.mdx

@@ -102,6 +102,19 @@ settings. Learn more about the [properties](#properties) or from an
 >
   Custom fonts. Apply globally or set different fonts for headings and the body
   text.
+
+  Example:
+  ```json
+  "font": {
+    "headings": {
+      "family": "Roboto"
+    },
+    "body": {
+      "family": "Oswald"
+    }
+  }
+  ```
+
   <Expandable title="FontDetailsType">
     <ResponseField name="family" type="string" required>
       The font family name. Custom fonts and all [Google