[FAB-5084] Push private data upon endorsement -typoFix

Fix a typo in the comments.

Change-Id: Icb4add3a24595bccbaa529e0bec7694488f84ec5
Signed-off-by: yacovm <yacovm@il.ibm.com>

gossip/privdata/distributor.go

@@ -47,7 +47,7 @@ type distributorImpl struct {
 }
 
 // NewDistributor a constructor for private data distributor capable to send
-// private read write sets for underlined collection
+// private read write sets for underlying collection
 func NewDistributor(chainID string, gossip gossipAdapter) PvtDataDistributor {
 	return &distributorImpl{
 		chainID:       chainID,