fix typos

Signed-off-by: allencloud <allen.sun@daocloud.io>

docs/storage/driver/middleware/cloudfront/middleware.go

@@ -18,7 +18,7 @@ import (
 	storagemiddleware "github.com/docker/distribution/registry/storage/driver/middleware"
 )
 
-// cloudFrontStorageMiddleware provides an simple implementation of layerHandler that
+// cloudFrontStorageMiddleware provides a simple implementation of layerHandler that
 // constructs temporary signed CloudFront URLs from the storagedriver layer URL,
 // then issues HTTP Temporary Redirects to this CloudFront content URL.
 type cloudFrontStorageMiddleware struct {

docs/storage/filereader_test.go

@@ -183,7 +183,7 @@ func TestFileReaderNonExistentFile(t *testing.T) {
 // conditions that can arise when reading a layer.
 func TestFileReaderErrors(t *testing.T) {
 	// TODO(stevvooe): We need to cover error return types, driven by the
-	// errors returned via the HTTP API. For now, here is a incomplete list:
+	// errors returned via the HTTP API. For now, here is an incomplete list:
 	//
 	// 	1. Layer Not Found: returned when layer is not found or access is
 	//        denied.

docs/storage/linkedblobstore.go

@@ -35,7 +35,7 @@ type linkedBlobStore struct {
 	// control the repository blob link set to which the blob store
 	// dispatches. This is required because manifest and layer blobs have not
 	// yet been fully merged. At some point, this functionality should be
-	// removed an the blob links folder should be merged. The first entry is
+	// removed the blob links folder should be merged. The first entry is
 	// treated as the "canonical" link location and will be used for writes.
 	linkPathFns []linkPathFunc