Fix typo in metadata key for server-hostname (#531)
Fix typo in metadata key for server-hostname (#531)

* Fix typo in metadata key for server-hostname

Motivation:

The server hostname was logged misleadingly with the metadata key
"hostname-override". This is meant to be "server-hostname".

Modifications:

Updated the metadata key to "server-hostname".

Result:

More accurate metadata keys.

* Update Sources/GRPC/ClientConnection.swift

grpc/grpc-swift,grpc/grpc-swift,grpc/grpc-swift,grpc/grpc-swift,grpc/grpc-swift