Add 3 links and update 2 links (#6513)

* Update free-courses-pt_BR.md

Add 3 links and update 2 links.

* Update free-courses-pt_BR.md

Just put in alfabethical order

* Update free-courses-pt_BR.md


Hi,
I undid my CSS and HTML category updates. Now everything is the same as 3 days ago
I just kept the new link to the MySQL course.
Thanks

Author: Paulojesus85

Diff for: courses/free-courses-pt_BR.md

@@ -84,6 +84,7 @@
 
 ### Database
 
+* [Curso de Banco de Dados MySQL](https://www.youtube.com/playlist?list=PLHz_AreHm4dkBs-795Dsgvau_ekxg8g1r) - Curso em Vídeo (Youtube)
 * [Curso de Modelagem de Dados](https://www.youtube.com/playlist?list=PLucm8g_ezqNoNHU8tjVeHmRGBFnjDIlxD) - Bosón Treinamentos (YouTube)
 * [Introdução ao MySQL e phpMyAdmin](https://www.udemy.com/mysql-phpmyadmin/) - Fernando Carmo, Mestres BI (Udemy)