Update mysql.md
Update mysql.md

Added an example with a database on a different host.
Phizho/tldr,cptdeka10/tldr,Phizho/tldr,zoisom/tldr,zoisom/tldr,deekim/tldr,kuanyui/tldr,felixonmars/tldr,mshmoustafa/tldr,felixonmars/tldr,mshmoustafa/tldr,deekim/tldr,kuanyui/tldr,UncommonPleb/tldr,AgamAgarwal/tldr,rubenvereecken/tldr,katekyan/tldr,felixonmars/tldr,UncommonPleb/tldr,WALL-E/tldr,cptdeka10/tldr,igorshubovych/tldr,UncommonPleb/tldr,slash3b/tldr,zoisom/tldr,deekim/tldr,rubenvereecken/tldr,Phizho/tldr,igorshubovych/tldr,katekyan/tldr,slash3b/tldr,cptdeka10/tldr,katekyan/tldr,WALL-E/tldr,AgamAgarwal/tldr,slash3b/tldr