Added that no special config changes reqd (#3906)
Added that no special config changes reqd (#3906)

Added a line saying no special config changes are required for Shared mode. Also the previous `Why Shared Backend` and current `Use cases` are already merged. This fixes the comment: https://github.com/minio/minio/pull/3888#discussion_r105573494
krisis/minio,fwessels/minio,aead/minio,dvstate/minio,hackintoshrao/minio,aead/minio,NitishT/minio,aead/minio,krishnasrinivas/minio,harshavardhana/minio,harshavardhana/minio,rushenn/minio,luomeiqin/minio,dutchcoders/minio,balamurugana/minio,rushenn/minio,jimjag/minio,krishnasrinivas/minio,jimjag/minio,aead/minio,krishnasrinivas/minio,aead/minio,harshavardhana/minio,rushenn/minio,hackintoshrao/minio,vadmeste/minio,harshavardhana/minio,dutchcoders/minio,brendanashworth/minio,aead/minio,harshavardhana/minio,dvstate/minio,jimjag/minio,dvstate/minio,brendanashworth/minio,NitishT/minio,aead/minio,donatello/minio,minio/minio,hackintoshrao/minio,hackintoshrao/minio,donatello/minio,fwessels/minio,luomeiqin/minio,NitishT/minio,krishnasrinivas/minio,NitishT/minio,dvstate/minio,abperiasamy/minio,abperiasamy/minio,harshavardhana/minio,fwessels/minio,minio/minio,dutchcoders/minio,harshavardhana/minio,vadmeste/minio,luomeiqin/minio,abperiasamy/minio,brendanashworth/minio,abperiasamy/minio,brendanashworth/minio,jimjag/minio,harshavardhana/minio,luomeiqin/minio,balamurugana/minio,aead/minio,rushenn/minio,krisis/minio,dutchcoders/minio,fwessels/minio