doc: clarify which api

vpn.go

@@ -3,7 +3,7 @@
 //go:generate protoc -I pb/ -I$GOPATH/src/github.com/grpc-ecosystem/grpc-gateway/third_party/googleapis pb/user.proto pb/vpn.proto pb/network.proto --grpc-gateway_out=logtostderr=true:pb
 //go:generate protoc -I pb/ -I$GOPATH/src/github.com/grpc-ecosystem/grpc-gateway/third_party/googleapis pb/user.proto pb/vpn.proto pb/network.proto --swagger_out=logtostderr=true:pb
 
-// Package ovpm provides the implementation of core API.
+// Package ovpm provides the implementation of core OVPM API.
 //
 // ovpm can create and destroy OpenVPN servers, manage vpn users, handle certificates etc...
 package ovpm