Tweak error message

Signed-off-by: Matt Lord <mattalord@gmail.com>

go/vt/vtctl/workflow/server.go

@@ -3399,7 +3399,7 @@ func (s *Server) switchWrites(ctx context.Context, req *vtctldatapb.WorkflowSwit
  // Does the source keyspace have tablets that are able to manage
  // the reverse workflow?
  if err := s.validatePrimaryTabletsHaveRequiredVReplicationPermissions(ctx, ts.SourceKeyspaceName(), ts.SourceShards()); err != nil {
- return handleError(fmt.Sprintf("primary tablets are not able to manage reverse vreplication stream in the %s keyspace",
+ return handleError(fmt.Sprintf("primary tablets are not able to fully manage the reverse vreplication workflow in the %s keyspace",
  ts.SourceKeyspaceName()), err)
  }
  // Does the target keyspace have tablets available to stream from