Golint: improve comments in merkledag/errservice.go

Per @kevina's comments

License: MIT
Signed-off-by: Hector Sanjuan <hector@protocol.ai>

errservice.go

@@ -14,34 +14,34 @@ type ErrorService struct {
 
 var _ ipld.DAGService = (*ErrorService)(nil)
 
-// Add returns an error.
+// Add returns the cs.Err.
 func (cs *ErrorService) Add(ctx context.Context, nd ipld.Node) error {
 	return cs.Err
 }
 
-// AddMany returns an error.
+// AddMany returns the cs.Err.
 func (cs *ErrorService) AddMany(ctx context.Context, nds []ipld.Node) error {
 	return cs.Err
 }
 
-// Get returns an error.
+// Get returns the cs.Err.
 func (cs *ErrorService) Get(ctx context.Context, c *cid.Cid) (ipld.Node, error) {
 	return nil, cs.Err
 }
 
-// GetMany many returns an error.
+// GetMany many returns the cs.Err.
 func (cs *ErrorService) GetMany(ctx context.Context, cids []*cid.Cid) <-chan *ipld.NodeOption {
 	ch := make(chan *ipld.NodeOption)
 	close(ch)
 	return ch
 }
 
-// Remove returns an error.
+// Remove returns the cs.Err.
 func (cs *ErrorService) Remove(ctx context.Context, c *cid.Cid) error {
 	return cs.Err
 }
 
-// RemoveMany returns an error.
+// RemoveMany returns the cs.Err.
 func (cs *ErrorService) RemoveMany(ctx context.Context, cids []*cid.Cid) error {
 	return cs.Err
 }