to prevent ".,"

Signed-off-by: Shubham Singh <116020663+1Shubham7@users.noreply.github.com>

cmd/oras/internal/option/packer.go

@@ -99,7 +99,7 @@ func (opts *Packer) LoadManifestAnnotations() (annotations map[string]map[string
 	}
 	if opts.AnnotationFilePath != "" {
 		if err = decodeJSON(opts.AnnotationFilePath, &annotations); err != nil {
-			return nil, fmt.Errorf("error loading manifest annotations from file %s: %w, " + 
+			return nil, fmt.Errorf("error loading manifest annotations from file %s: %w " + 
 				"refer to the document at https://oras.land/docs/how_to_guides/manifest_annotations", opts.AnnotationFilePath, err)
 		}