[FIX] Add missing closing bracket in pullRequest example code

Author: daniellienert

doc/pull_requests.md

@@ -67,6 +67,7 @@ $pullRequest = $client->api('pull_request')->create('ezsystems', 'ezpublish', ar
     'head'  => 'testbranch',
     'title' => 'My nifty pull request',
     'body'  => 'This pull request contains a bunch of enhancements and bug-fixes, happily shared with you'
+    )
 );
 ```