chore: Updating final Attributes docs for v3

markdown/dev/reference/api/attributes/render/en.md

@@ -0,0 +1,23 @@
+---
+title: Attributes.render()
+---
+
+The `Attributes.render()` method will render attributes as a string suitable
+for inclusion in an SVG tag.
+
+## Signature
+
+```js
+string attributes.render()
+```
+
+## Example
+
+```js
+const attr = new Attributes()
+  .set('id', 'example')
+  .add('class', 'classA')
+  .add('class', 'classb')
+
+const paragraph = `<p ${attr.render()}>Hello</p>`
+```