Fix go lint errors

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

services/content/reader.go

@@ -44,6 +44,6 @@ func (ra *remoteReaderAt) ReadAt(p []byte, off int64) (n int, err error) {
 	return n, nil
 }
 
-func (rr *remoteReaderAt) Close() error {
+func (ra *remoteReaderAt) Close() error {
 	return nil
 }

services/content/store.go

@@ -15,6 +15,7 @@ type remoteStore struct {
 	client contentapi.ContentClient
 }
 
+// NewStoreFromClient returns a new content store
 func NewStoreFromClient(client contentapi.ContentClient) content.Store {
 	return &remoteStore{
 		client: client,

services/diff/client.go

@@ -9,7 +9,7 @@ import (
 	"golang.org/x/net/context"
 )
 
-// NewApplierFromClient returns a new Applier which communicates
+// NewDiffServiceFromClient returns a new diff service which communicates
 // over a GRPC connection.
 func NewDiffServiceFromClient(client diffapi.DiffClient) diff.Differ {
 	return &remote{

services/images/client.go

@@ -13,6 +13,7 @@ type remoteStore struct {
 	client imagesapi.ImagesClient
 }
 
+// NewStoreFromClient returns a new image store client
 func NewStoreFromClient(client imagesapi.ImagesClient) images.Store {
 	return &remoteStore{
 		client: client,

services/namespaces/client.go

@@ -10,6 +10,7 @@ import (
 	"github.com/gogo/protobuf/types"
 )
 
+// NewStoreFromClient returns a new namespace store
 func NewStoreFromClient(client api.NamespacesClient) namespaces.Store {
 	return &remote{client: client}
 }