Additional updates to SSL_CTX_sess_set_get_cb.pod
Generally modernize the language. Refer to TLS instead of SSL/TLS, and try to have more consistent usage of commas and that/which. Reword some descriptions to avoid implying that a list of potential reasons for behavior is an exhaustive list. Clarify how get_session_cb() is only called on servers (i.e., in general, and that it's given the session ID proposed by the client). Clarify the semantics of the get_cb()'s "copy" argument. The behavior seems to have changed in commit 8876bc05, though the behavior prior to that commit was not to leave the reference-count unchanged if *copy was not written to -- instead, libssl seemed to assume that the callback already had incremented the reference count. Reviewed-by: NTomas Mraz <tmraz@fedoraproject.org> (Merged from https://github.com/openssl/openssl/pull/10943) (cherry picked from commit 06f876837a8ec76b28c42953731a156c0c3700e2)
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