Update nextcloud content.md with mariadb command

nextcloud/content.md

@@ -155,6 +155,7 @@ volumes:
 services:
   db:
     image: mariadb
+    command: --transaction-isolation=READ-COMMITTED --binlog-format=ROW
     restart: always
     volumes:
       - db:/var/lib/mysql
@@ -195,6 +196,7 @@ volumes:
 services:
   db:
     image: mariadb
+    command: --transaction-isolation=READ-COMMITTED --binlog-format=ROW
     restart: always
     volumes:
       - db:/var/lib/mysql