Update faq for connection closed BEFORE error (#2263)
Update faq for connection closed BEFORE error (#2263)

`max-keep-alive-requests` might be a reason for connection close

Co-authored-by: Violeta Georgieva <584af79351bcb8c5a9fb740ab1135189a72bcfc1@vmware.com>
reactor/reactor-netty,reactor/reactor-netty