phpdoc fixes

laravel/database/schema/grammars/grammar.php

@@ -9,7 +9,7 @@ abstract class Grammar extends \Laravel\Database\Grammar {
 	 * Generate the SQL statement for creating a foreign key.
 	 *
 	 * @param  Table    $table
-	 * @param  Command  $command
+	 * @param  Fluent  $command
 	 * @return string
 	 */
 	public function foreign(Table $table, Fluent $command)
@@ -54,7 +54,7 @@ abstract class Grammar extends \Laravel\Database\Grammar {
 	 * Drop a constraint from the table.
 	 *
 	 * @param  Table   $table
-	 * @param  Fluent  $fluent
+	 * @param  Fluent  $command
 	 * @return string
 	 */
 	protected function drop_constraint(Table $table, Fluent $command)