Fix extra quote in docs.md

www/docs.md

@@ -147,7 +147,7 @@ Here is a `div` that posts to `/mouse_entered` when a mouse enters it:
 If you want a request to only happen once, you can use the `once` modifier for the trigger:
 
 ```html
-   <div hx-post="/mouse_entered" hx-trigger="mouseenter once"">
+   <div hx-post="/mouse_entered" hx-trigger="mouseenter once">
      [Here Mouse, Mouse!]
    </div>
 ```