Add troubleshooting doc for SMTP settings
Many users run into the error message `OpenSSL::SSL::SSLError (SSL_connect returned=1 errno=0 state=error: wrong version number)` when configuring SMTP. This is usually due to incorrect settings with TLS, and this documentation provides a troubleshooting guide for checking the proper values are set. Closes https://gitlab.com/gitlab-org/omnibus-gitlab/-/issues/5013
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