zip: fix doc for CreateFromVCS function

CreateFromVCS returns UnrecognizedVCSError.

Change-Id: I54e9be4c44eb889657c581a34d38987042be9ad2
Reviewed-on: https://go-review.googlesource.com/c/mod/+/502435
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Auto-Submit: Bryan Mills <bcmills@google.com>

zip/zip.go

@@ -581,7 +581,7 @@ func CreateFromDir(w io.Writer, m module.Version, dir string) (err error) {
 // "sub/dir". To create a zip from the base of the repository, pass an empty
 // string.
 //
-// If CreateFromVCS returns ErrUnrecognizedVCS, consider falling back to
+// If CreateFromVCS returns UnrecognizedVCSError, consider falling back to
 // CreateFromDir.
 func CreateFromVCS(w io.Writer, m module.Version, repoRoot, revision, subdir string) (err error) {
 	defer func() {

zip/zip_test.go

@@ -1736,7 +1736,7 @@ var A = 5
 	}
 	var gotErr *modzip.UnrecognizedVCSError
 	if !errors.As(err, &gotErr) {
-		t.Errorf("CreateFromVCS: returned error does not unwrap to modzip.ErrUnrecognisedVCS, but expected it to. returned error: %v", err)
+		t.Errorf("CreateFromVCS: returned error does not unwrap to modzip.UnrecognizedVCSError, but expected it to. returned error: %v", err)
 	} else if gotErr.RepoRoot != tmpDir {
 		t.Errorf("CreateFromVCS: returned error has RepoRoot %q, but want %q. returned error: %v", gotErr.RepoRoot, tmpDir, err)
 	}