Migrate Sirupsen to sirupsen.

vendor/github.com/docker/distribution/blobs.go

@@ -152,7 +152,7 @@ type BlobProvider interface {
 
 // BlobServer can serve blobs via http.
 type BlobServer interface {
-	// ServeBlob attempts to serve the blob, identifed by dgst, via http. The
+	// ServeBlob attempts to serve the blob, identified by dgst, via http. The
 	// service may decide to redirect the client elsewhere or serve the data
 	// directly.
 	//