[Cache]Update cache-keys.mdx (cloudflare#23351)

Not sure its possible; could we set it in `` to highlight the command?

Author: nenizera

src/content/docs/cache/how-to/cache-keys.mdx

@@ -77,8 +77,8 @@ If you include the query string foo in a URL like `https://www.example.com/?foo=
 
 #### Usage notes
 
-* To include all query string parameters (the default behavior), use include: "\*"
-* To ignore query strings, use exclude: "\*"
+* To include all query string parameters (the default behavior), use include: `"\*"`
+* To ignore query strings, use exclude: `"\*"`
 * To include most query string parameters but exclude a few, use the exclude field which assumes the other query string parameters are included.
 
 ### Headers