resolves https://github.com/elastic/kibana/issues/88333
Fixed:
- add note that `secure: false` will use TLS, but after an initial connection
with TCP; we have been getting questions from customers who believed that
`secure: false` implied TLS was not used at all.
- added a link to the nodemailer "well-known services" module, to allow
customers to see examples of other email service configurations
- updated the Outlook config example to use the current nodemailer values
- couple of other small tweaks
e221992da3