doc: add session cache usage to OpenSSL example

Sometimes, one process is all you need :>

Fwiw, I am also experimenting with the following in my
yahns.conf.rb file:

scache_stats = lambda do |env|
  s = ctx.session_cache_stats.inspect << "\n"
  [200, [%W(Content-Length #{s.size}), %w(Content-Type text/plain)], [s]]
end
app(:rack, scache_stats, preload: true) do
  listen "unix:/tmp/yahns-scache.#$$.sock"
end

Which allows me to get stats based on the master PID (not worker):

  printf 'GET / HTTP/1.0\r\n\r\n' | socat - UNIX:/tmp/yahns-scache.$PID.sock

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