LENS-351 : Document db resources feature in user guide
LENS-351 : Document db resources feature in user guide

sushilmohanty/incubator-lens,guptapuneet/lens,kamaldeep-ebay/lens,archanah24/lens,adeelmahmood/lens,RaghavendraSingh/lens,sushrutikhar/grill,sriksun/incubator-lens,sriksun/incubator-lens,kamaldeep-ebay/lens,kamaldeep-ebay/lens,guptapuneet/lens,sushilmohanty/incubator-lens,sushrutikhar/grill,kamaldeep-ebay/lens,archanah24/lens,sushilmohanty/incubator-lens,adeelmahmood/lens,guptapuneet/lens,sushrutikhar/grill,sushilmohanty/incubator-lens,archanah24/lens,sriksun/incubator-lens,sushilmohanty/incubator-lens,guptapuneet/lens,sriksun/incubator-lens,archanah24/lens,RaghavendraSingh/lens,archanah24/lens,adeelmahmood/lens,adeelmahmood/lens,RaghavendraSingh/lens,sushrutikhar/grill,RaghavendraSingh/lens,sriksun/incubator-lens,RaghavendraSingh/lens,sushrutikhar/grill