Specify the Community Edition of MySQL

and fix some grammar.

src/_posts/databases/mysql/2000-01-01-overview.md

@@ -16,9 +16,9 @@ of applications, from small-scale websites to large-scale enterprise solutions.
 
 ## Scalingo for MySQL®
 
-Scalingo for MySQL® is our official MySQL® addon. [We have several
-plans available](https://scalingo.com/databases/mysql#database-compare),
-which you can chose of depending on your needs and budget. As always, a free
+Scalingo for MySQL® (Community Edition) is our official MySQL® addon. [We have several
+plans available](https://scalingo.com/databases/mysql#database-compare)
+from which you can choose depending on your needs and budget. As always, a free
 plan is available for you to test our offer.
 
 ### Features