Change URL to match

[ConnectedSystems]

Minor pedantic change request.

Add "s" to "doc". in doc.riskdatalibrary.org

"Docs" is the usual parlance used to refer to documentation (as it is a set of documents)

See for example:

• https://**docs**.microsoft.com/
• https://www.mk**docs**.org/

[pzwsk]

Done in DNS and Github settings, please allow few min to update.