Apply suggestions from code review

Co-authored-by: lhchavez <lhchavez@lhchavez.com>

reference.go

@@ -504,9 +504,6 @@ const (
 // characters and collapsing runs of adjacent slashes between name components
 // into a single slash.
 //
-// Once normalized, if the reference name is valid, it will be returned in the
-// user allocated buffer.
-//
 // See git_reference_symbolic_create() for rules about valid names.
 func ReferenceNormalizeName(name string, flags ReferenceFormat) (string, error) {
 	cname := C.CString(name)

reference_test.go

@@ -231,7 +231,7 @@ func TestReferenceNormalizeName(t *testing.T) {
 	checkFatal(t, err)
 
 	if ref != "refs/heads/master" {
-		t.Errorf("refs/heads//master should be normalized correctly")
+		t.Errorf("ReferenceNormalizeName(%q) = %q; want %q", "refs/heads//master", ref, want)
 	}
 
 	ref, err = ReferenceNormalizeName("master", ReferenceFormatAllowOnelevel|ReferenceFormatRefspecShorthand)