Update documentation links

Author: iMattPro

skeleton/migrations/install_sample_data.php.twig

@@ -27,7 +27,7 @@ class install_sample_data extends \phpbb\db\migration\migration
 	/**
 	 * Add, update or delete data stored in the database during extension installation.
 	 *
-	 * https://area51.phpbb.com/docs/dev/3.2.x/migrations/data_changes.html
+	 * https://area51.phpbb.com/docs/dev/3.3.x/migrations/data_changes.html
 {% if COMPONENT.migration %}
 	 *  config.add: Add config data.
 	 *  config.update: Update config data.
@@ -99,7 +99,7 @@ class install_sample_data extends \phpbb\db\migration\migration
 	 * and only needs to be used to perform custom un-installation changes, such as to revert
 	 * changes made by custom functions called in update_data.
 	 *
-	 * https://area51.phpbb.com/docs/dev/3.2.x/migrations/data_changes.html
+	 * https://area51.phpbb.com/docs/dev/3.3.x/migrations/data_changes.html
 	 *  config.add: Add config data.
 	 *  config.update: Update config data.
 	 *  config.remove: Remove config.

skeleton/migrations/install_sample_schema.php.twig

@@ -25,7 +25,7 @@ class install_sample_schema extends \phpbb\db\migration\migration
 	/**
 	 * Update database schema.
 	 *
-	 * https://area51.phpbb.com/docs/dev/3.2.x/migrations/schema_changes.html
+	 * https://area51.phpbb.com/docs/dev/3.3.x/migrations/schema_changes.html
 	 *	add_tables: Add tables
 	 *	drop_tables: Drop tables
 	 *	add_columns: Add columns to a table
@@ -69,7 +69,7 @@ class install_sample_schema extends \phpbb\db\migration\migration
 	 * Revert database schema changes. This method is almost always required
 	 * to revert the changes made above by update_schema.
 	 *
-	 * https://area51.phpbb.com/docs/dev/3.2.x/migrations/schema_changes.html
+	 * https://area51.phpbb.com/docs/dev/3.3.x/migrations/schema_changes.html
 	 *	add_tables: Add tables
 	 *	drop_tables: Drop tables
 	 *	add_columns: Add columns to a table