[mongo][doc] Add more info about `ssl_cert_reqs` config (#2562)
[mongo][doc] Add more info about `ssl_cert_reqs` config (#2562)

[skip ci]
Reviewed-by: da39a3ee5e6b4b0d3255bfef95601890afd80709@degemer

indeedops/dd-agent,Wattpad/dd-agent,Wattpad/dd-agent,manolama/dd-agent,indeedops/dd-agent,Wattpad/dd-agent,takus/dd-agent,jyogi/purvar-agent,takus/dd-agent,takus/dd-agent,indeedops/dd-agent,jyogi/purvar-agent,manolama/dd-agent,cberry777/dd-agent,Wattpad/dd-agent,manolama/dd-agent,jyogi/purvar-agent,indeedops/dd-agent,manolama/dd-agent,indeedops/dd-agent,cberry777/dd-agent,jyogi/purvar-agent,manolama/dd-agent,cberry777/dd-agent,takus/dd-agent,cberry777/dd-agent,cberry777/dd-agent,jyogi/purvar-agent,Wattpad/dd-agent,takus/dd-agent