fix: README section Example of Use

Description

Fixed typo on documentation (README.md) section Example of Use, from :
db1.vpn.local and db1.vpn.local
to :
db1.vpn.local and db2.vpn.local

db1.vpn.local (the latter) should be db2.vpn.local.

Related issue

Examples

Checklist

• the MR description has been reviewed
• this MR contains text changes and they have been reviewed OR there are no texts changes
• this MR contains GUI/CLI changes and they have been reviewed OR there are no GUI/CLI changes
• this MR contains API changes and they have been reviewed OR there are no API changes