ConnSSL_HandleError: Code cleanup, more documentation
Make SSL-related log messages more readable

 - Don't use internal function names but describe the error.
 - Streamline wording, use "SSL" for SSL and TLS.
 - Streamline punctuation.
Merge branch 'ssl-log-messages'

* ssl-log-messages:
  Make SSL-related log messages more readable
  ConnSSL_HandleError: Code cleanup, more documentation