The current message for the TextMapExtractAdapter is currently referring to the wrong class. This PR changes it from TextMapInjectAdapter to TextMapExtractAdapter.
Coverage remained the same at 73.368% when pulling 7f705fd6084a63b21e83014730ad4b91f76c5f78 on sebsandberg:fix_error_message_for_TextMapExtractAdapter into 58846260a696f3cc06ae7c4ef1798d95a170300c on opentracing:master.
The current message for the TextMapExtractAdapter is currently referring to the wrong class. This PR changes it from TextMapInjectAdapter to TextMapExtractAdapter.