Updated utfmb4 upgrade command

Author: ssddanbrown

app/Console/Commands/UpgradeDatabaseEncoding.php

@@ -12,7 +12,7 @@ class UpgradeDatabaseEncoding extends Command
      *
      * @var string
      */
-    protected $signature = 'bookstack:db-utf8mb4-syntax {--database= : The database connection to use.}';
+    protected $signature = 'bookstack:db-utf8mb4 {--database= : The database connection to use.}';
 
     /**
      * The console command description.

database/migrations/2017_07_02_152834_update_db_encoding_to_ut8mb4.php

@@ -12,7 +12,7 @@ class UpdateDbEncodingToUt8mb4 extends Migration
     public function up()
     {
         // Migration removed due to issues during live migration.
-        // Instead you can run the command `artisan bookstack:db-utf8mb4-syntax`
+        // Instead you can run the command `artisan bookstack:db-utf8mb4`
         // which will generate out the SQL request to upgrade your DB to utf8mb4.
     }