Docs
Cosmetic changes
Explicitly destroy TLS context

An axTLS context grabs fd for /dev/urandom.  It is freed when
the context is GC-ed, but sometimes GC isn't triggered often enough
before unfinalized contexts eat up all the fds.   (/dev/urandom
is opened deep inside tls library, so we can't trigger GC by
EMFILE.)

Also adjusted rfc.http to destroy TLS context.