improve --tls-cipher-list and TLS session resumption docs
While working on session resumption for TLSv1.3, I found the current session resumption docs not very useful, I hope this improves them.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines