[Workers]Update cache.mdx

Following the same style as the other methods `Match` and `Delete` in this doc.

Author: nenizera

src/content/docs/workers/runtime-apis/cache.mdx

@@ -91,7 +91,7 @@ Use the `Cache-Control` method to store the response without the `Set-Cookie` he
 
 ## Methods
 
-### Put
+### `Put`
 
 ```js
 cache.put(request, response);