Update docs

Author: Yokozuna59

docs/config/setup/interfaces/mermaidAPI.RenderResult.md

@@ -14,6 +14,15 @@
 
 • `Optional` **bindFunctions**: (`element`: `Element`) => `void`
 
+Bind function to be called after the svg has been inserted into the DOM.
+This is necessary for adding event listeners to the elements in the svg.
+
+```js
+const { svg, bindFunctions } = mermaidAPI.render('id1', 'graph TD;A-->B');
+div.innerHTML = svg;
+bindFunctions?.(div); // To call bindFunctions only if it's present.
+```
+
 #### Type declaration
 
 ▸ (`element`): `void`