Make curl example consistent.

jdennes · jdennes · commit 704755882420 · 2013-11-29T14:42:13.000+01:00
diff --git a/content/v3.md b/content/v3.md
@@ -389,7 +389,7 @@ User-Agent: Awesome-Octocat-App
 If you provide an invalid `User-Agent` header, you will receive a `403 Forbidden` response:
 
 <pre class="terminal">
-curl -iH 'User-Agent: ' https://api.github.com/meta
+$ curl -iH 'User-Agent: ' https://api.github.com/meta
 HTTP/1.0 403 Forbidden
 Connection: close
 Content-Type: text/html
