Update fluent-config-api-v3-v4.md
Update fluent-config-api-v3-v4.md

Added a link to the configuration webminar
SzymonPobiega/docs.particular.net,pashute/docs.particular.net,yuxuac/docs.particular.net,WojcikMike/docs.particular.net,pedroreys/docs.particular.net,eclaus/docs.particular.net