Removed note on old versions of MariaDB & MySQL (#8678)

Author: LucaRed

migrations.md

@@ -1146,23 +1146,6 @@ Command  |  Description
 `$table->fullText('body')->language('english');`  |  Adds a full text index of the specified language (PostgreSQL).
 `$table->spatialIndex('location');`  |  Adds a spatial index (except SQLite).
 
-<a name="index-lengths-mysql-mariadb"></a>
-#### Index Lengths & MySQL / MariaDB
-
-By default, Laravel uses the `utf8mb4` character set. If you are running a version of MySQL older than the 5.7.7 release or MariaDB older than the 10.2.2 release, you may need to manually configure the default string length generated by migrations in order for MySQL to create indexes for them. You may configure the default string length by calling the `Schema::defaultStringLength` method within the `boot` method of your `App\Providers\AppServiceProvider` class:
-
-    use Illuminate\Support\Facades\Schema;
-
-    /**
-     * Bootstrap any application services.
-     */
-    public function boot(): void
-    {
-        Schema::defaultStringLength(191);
-    }
-
-Alternatively, you may enable the `innodb_large_prefix` option for your database. Refer to your database's documentation for instructions on how to properly enable this option.
-
 <a name="renaming-indexes"></a>
 ### Renaming Indexes