Add FAQ entry for "Got bad greeting from SMTP host"

Per https://github.com/eclipse-ee4j/angus-mail/issues/109 the error seen was:
````
[07-09-2023 18:46:26][AP-Web][WARN] Details: Got bad greeting from SMTP host: localhost, port: 465, response: [EOF]
[07-09-2023 18:46:26][AP-Web][WARN] Type: jakarta.mail.MessagingException
[07-09-2023 18:46:26][AP-Web][WARN] Stacktrace:
[07-09-2023 18:46:26][AP-Web][WARN] org.eclipse.angus.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2231)
[07-09-2023 18:46:26][AP-Web][WARN] org.eclipse.angus.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:729)
[07-09-2023 18:46:26][AP-Web][WARN] jakarta.mail.Service.connect(Service.java:345)
[07-09-2023 18:46:26][AP-Web][WARN] jakarta.mail.Service.connect(Service.java:225)
[07-09-2023 18:46:26][AP-Web][WARN] jakarta.mail.Service.connect(Service.java:246)
[07-09-2023 18:46:26][AP-Web][WARN] jakarta.mail.Transport.send0(Transport.java:230)
[07-09-2023 18:46:26][AP-Web][WARN] jakarta.mail.Transport.send(Transport.java:152)
````

Setting `mail.smtp.ssl.enable=true` fixed the issue.

1. Add a [FAQ entry](https://github.com/eclipse-ee4j/angus-mail/blob/master/www/FAQ.html) for `Got bad greeting from SMTP host: , port: , response: [EOF]`
2. Add some details explaining that the server most likely expected an SSL connection instead of TLS.
3. Explain that the resolution is to add `mail.smtp.ssl.enable=true` and remove `mail.smtp.starttls.enable=true`

Start with www/FAQ.html and review the linked Angus Mail issue 109 for context. Add an FAQ entry for the exact "Got bad greeting from SMTP host" response, explaining that the server likely expects SSL rather than TLS. Done means documenting the ssl.enable setting and removing the starttls.enable setting.

Written by the indexing model from the issue text.