Added string as a possible return type for methods (#635)

Author: morozov

lib/Github/Api/PullRequest.php

@@ -77,7 +77,7 @@ public function all($username, $repository, array $params = array())
      * @param string $repository the repository
      * @param string $id         the ID of the pull request for which details are retrieved
      *
-     * @return array array of pull requests for the project
+     * @return array|string pull request details
      */
     public function show($username, $repository, $id)
     {

lib/Github/Api/Repository/Contents.php

@@ -64,7 +64,7 @@ public function readme($username, $repository, $reference = null)
      * @param null|string $path       path to file or directory
      * @param null|string $reference  reference to a branch or commit
      *
-     * @return array information for file | information for each item in directory
+     * @return array|string information for file | information for each item in directory
      */
     public function show($username, $repository, $path = null, $reference = null)
     {