Fix migration docs and empty methods

Signed-off-by: Joas Schilling <coding@schilljs.com>

lib/Migration/Version2000Date20171026140256.php

@@ -29,9 +29,6 @@ use OCP\IGroupManager;
 use OCP\Migration\SimpleMigrationStep;
 use OCP\Migration\IOutput;
 
-/**
- * Auto-generated migration step: Please modify to your needs!
- */
 class Version2000Date20171026140256 extends SimpleMigrationStep {
 
 	/** @var IDBConnection */

lib/Migration/Version2000Date20171026140257.php

@@ -29,9 +29,6 @@ use OCP\Migration\SimpleMigrationStep;
 use OCP\Migration\IOutput;
 use OCP\Security\ISecureRandom;
 
-/**
- * Auto-generated migration step: Please modify to your needs!
- */
 class Version2000Date20171026140257 extends SimpleMigrationStep {
 
 	/** @var IDBConnection */

lib/Migration/Version2001Date20170707115443.php

@@ -43,15 +43,6 @@ class Version2001Date20170707115443 extends SimpleMigrationStep {
 		$this->db = $db;
 	}
 
-	/**
-	 * @param IOutput $output
-	 * @param \Closure $schemaClosure The `\Closure` returns a `Schema`
-	 * @param array $options
-	 * @since 13.0.0
-	 */
-	public function preSchemaChange(IOutput $output, \Closure $schemaClosure, array $options) {
-	}
-
 	/**
 	 * @param IOutput $output
 	 * @param \Closure $schemaClosure The `\Closure` returns a `Schema`

lib/Migration/Version2001Date20171026141336.php

@@ -28,7 +28,6 @@ use OCP\Migration\IOutput;
 
 class Version2001Date20171026141336 extends SimpleMigrationStep {
 
-
 	/**
 	 * @param IOutput $output
 	 * @param \Closure $schemaClosure The `\Closure` returns a `Schema`

lib/Migration/Version2001Date20171031102049.php

@@ -1,4 +1,25 @@
 <?php
+/**
+ * @copyright Copyright (c) 2017 Joas Schilling <coding@schilljs.com>
+ *
+ * @author Joas Schilling <coding@schilljs.com>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
 namespace OCA\Spreed\Migration;
 
 use Doctrine\DBAL\Schema\Schema;
@@ -6,20 +27,8 @@ use Doctrine\DBAL\Types\Type;
 use OCP\Migration\SimpleMigrationStep;
 use OCP\Migration\IOutput;
 
-/**
- * Auto-generated migration step: Please modify to your needs!
- */
 class Version2001Date20171031102049 extends SimpleMigrationStep {
 
-	/**
-	 * @param IOutput $output
-	 * @param \Closure $schemaClosure The `\Closure` returns a `Schema`
-	 * @param array $options
-	 * @since 13.0.0
-	 */
-	public function preSchemaChange(IOutput $output, \Closure $schemaClosure, array $options) {
-	}
-
 	/**
 	 * @param IOutput $output
 	 * @param \Closure $schemaClosure The `\Closure` returns a `Schema`
@@ -40,12 +49,4 @@ class Version2001Date20171031102049 extends SimpleMigrationStep {
 		return $schema;
 	}
 
-	/**
-	 * @param IOutput $output
-	 * @param \Closure $schemaClosure The `\Closure` returns a `Schema`
-	 * @param array $options
-	 * @since 13.0.0
-	 */
-	public function postSchemaChange(IOutput $output, \Closure $schemaClosure, array $options) {
-	}
 }