Add some missing type hints

Summary: Add some typehints for Remarkup rules.

Test Plan: Browsed around some Remarkup text.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D12694

src/applications/phriction/markup/PhrictionRemarkupRule.php

@@ -13,8 +13,7 @@ final class PhrictionRemarkupRule extends PhutilRemarkupRule {
       $text);
   }
 
-  public function markupDocumentLink($matches) {
-
+  public function markupDocumentLink(array $matches) {
     $link = trim($matches[1]);
     $name = trim(idx($matches, 2, $link));
     if (empty($matches[2])) {