Error message changed from the legacy validator

[brianpos]

While switching over from the legacy validator to this new one the error message for this issue has changed

firely-validator-api/src/Firely.Fhir.Validation/Impl/ExtensionSchema.cs

Line 100 in 7915e06

new IssueAssertion(issue, $"Unable to resolve reference to extension '{group.Key}'.")

In the legacy one was

$"Unable to resolve reference to profile '{entry.Reference}'"

https://github.com/FirelyTeam/Hl7.Fhir.Validation.Legacy/blob/e21f77723960bd68eac2a029f8922a1f7fb7a074/src/Hl7.Fhir.Validation.Legacy.Shared/Validation/ProfileAssertion.cs#L207

This one has

Unable to resolve reference to extension '{group.Key}'.

Wondering if the difference was intended.