Addressed comments

csi.proto

@@ -523,12 +523,12 @@ message NodeStageVolumeRequest {
   // has `PUBLISH_UNPUBLISH_VOLUME` controller capability, and SHALL be
   // left unset if the corresponding Controller Plugin does not have
   // this capability. This is an OPTIONAL field.
-  map<string, string> publish_volume_info = 3;
+  map<string, string> publish_info = 3;
 
   // The path to which the volume will be published. It MUST be an
   // absolute path in the root filesystem of the process serving this
-  // request. The CO SHALL ensure uniqueness of staging_target_path per
-  // volume.
+  // request. The CO SHALL ensure that there is only one 
+  // staging_target_path per volume.
   // This is a REQUIRED field.
   string staging_target_path = 4;
 
@@ -555,13 +555,7 @@ message NodeStageVolumeRequest {
   map<string,string> volume_attributes = 7;
 }
 
-message NodeStageVolumeResponse {
-  // The SP specific information that will be passed to the Plugin in
-  // the subsequent `NodePublishVolume` calls
-  // for the given volume.
-  // This information is opaque to the CO. This field is OPTIONAL.
-  map<string, string> publish_volume_info = 1;
-}
+message NodeStageVolumeResponse {}
 ////////
 ////////
 message NodeUnstageVolumeRequest {