Fix string doc type casing

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

lib/private/Files/Filesystem.php

@@ -627,7 +627,7 @@ class Filesystem {
 	 * check if the directory should be ignored when scanning
 	 * NOTE: the special directories . and .. would cause never ending recursion
 	 *
-	 * @param String $dir
+	 * @param string $dir
 	 * @return boolean
 	 */
 	static public function isIgnoredDir($dir) {

lib/private/Files/Node/Root.php

@@ -348,7 +348,7 @@ class Root extends Folder implements IRootFolder {
 	/**
 	 * Returns a view to user's files folder
 	 *
-	 * @param String $userId user ID
+	 * @param string $userId user ID
 	 * @return \OCP\Files\Folder
 	 * @throws \OC\User\NoUserException
 	 */

lib/private/legacy/util.php

@@ -390,7 +390,7 @@ class OC_Util {
 	/**
 	 * copies the skeleton to the users /files
 	 *
-	 * @param String $userId
+	 * @param string $userId
 	 * @param \OCP\Files\Folder $userDirectory
 	 * @throws \OCP\Files\NotFoundException
 	 * @throws \OCP\Files\NotPermittedException

lib/public/Files/IRootFolder.php

@@ -37,7 +37,7 @@ interface IRootFolder extends Folder, Emitter {
 	/**
 	 * Returns a view to user's files folder
 	 *
-	 * @param String $userId user ID
+	 * @param string $userId user ID
 	 * @return \OCP\Files\Folder
 	 * @since 8.2.0
 	 */