Readme Typo when referring to pre-existing db folder (#2212)

Author: rouralberto

mariadb/content.md

@@ -198,7 +198,7 @@ See [the "Official Images" FAQ](https://github.com/docker-library/faq#healthchec
 
 ## Usage against an existing database
 
-If you start your `%%IMAGE%%` container instance with a data directory that already contains a database (specifically, a `mysql` subdirectory), no environment variables that control initialization will be needed or examined, and no pre-existing databases will not be changed. The only exception is the non-default `MARIADB_AUTO_UPGRADE` environment variable, that might cause `mysql_upgrade`/`mariadb-upgrade` to run, which might change the system tables.
+If you start your `%%IMAGE%%` container instance with a data directory that already contains a database (specifically, a `mysql` subdirectory), no environment variables that control initialization will be needed or examined, and no pre-existing databases will be changed. The only exception is the non-default `MARIADB_AUTO_UPGRADE` environment variable, that might cause `mysql_upgrade`/`mariadb-upgrade` to run, which might change the system tables.
 
 ## Creating database dumps