Update links in solace_source.properties

[hholst80]

Neither of the two links pointing out additional documentation works, and returns 404.

# Connector TLS session to PubSub+ message broker properties
# Specify if required when using TLS / Client certificate authentication
# May require setup of keystore and truststore on each host where the connector is deployed
# Refer to https://docs.solace.com/Overviews/TLS-SSL-Message-Encryption-Overview.htm
# and https://docs.solace.com/Overviews/Client-Authentication-Overview.htm#Client-Certificate