update the docblock of the fluentCommands property in the MySqlGramme…

…r file (#53509)

src/Illuminate/Database/Schema/Grammars/MySqlGrammar.php

@@ -29,7 +29,7 @@ class MySqlGrammar extends Grammar
     protected $serials = ['bigInteger', 'integer', 'mediumInteger', 'smallInteger', 'tinyInteger'];
 
     /**
-     * The commands to be executed outside of create or alter command.
+     * The commands to be executed outside of create or alter commands.
      *
      * @var string[]
      */