SONAR-12246 remove from sonar.properties

sonar-application/src/main/assembly/conf/sonar.properties

@@ -7,7 +7,7 @@
 #
 # IMPORTANT:
 # - The embedded H2 database is used by default. It is recommended for tests but not for
-#   production use. Supported databases are MySQL, Oracle, PostgreSQL and Microsoft SQLServer.
+#   production use. Supported databases are Oracle, PostgreSQL and Microsoft SQLServer.
 # - Changes to database connection URL (sonar.jdbc.url) can affect SonarSource licensed products.
 
 # User credentials.