Update S4830: add a message on secondary locations

[nicolas-harraudeau-sonarsource]

RSPEC-4830 creates a secondary location on functions' return value. This location can be quite far from the primary location and developers will expect to navigate to it in SonarLint. Thus we need to add a message to this secondary location.

@eric-therond-sonarsource any idea for the message? I would suggest "This function trusts all certificates."

The secondary location message is written in the RSPEC.

[eric-therond-sonarsource]

@nicolas-harraudeau-sonarsource your suggestion "This function trusts all certificates." seems really good.