fix doc format

Author: jackfranklin

docs/tool-reference.md

@@ -277,16 +277,15 @@ so returned values have to JSON-serializable.
 
 - **args** (array) _(optional)_: An optional list of arguments to pass to the function.
 - **function** (string) **(required)**: A JavaScript function to run in the currently selected page.
-Example without arguments: `() => {
+  Example without arguments: `() => {
   return document.title
 }` or `async () => {
   return await fetch("example.com")
 }`.
-Example with arguments: `(el) => {
+  Example with arguments: `(el) => {
   return el.innerText;
 }`
 
-
 ---
 
 ### `list_console_messages`