add prettier-ignore

documentation/docs/02-template-syntax/02-basic-markup.md

@@ -113,6 +113,7 @@ Text can also contain JavaScript expressions:
 
 > If you're using a regular expression (`RegExp`) [literal notation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#literal_notation_and_constructor), you'll need to wrap it in parentheses.
 
+<!-- prettier-ignore -->
 ```svelte
 <h1>Hello {name}!</h1>
 <p>{a} + {b} = {a + b}.</p>