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,