start on incorrect function error handling

cmd/gh/main.go

@@ -176,6 +176,12 @@ func mainRun() exitCode {
 
 		printError(stderr, err, cmd, hasDebug)
 
+		if strings.Contains(err.Error(), "Incorrect function") {
+			fmt.Fprintln(stderr, "You appear to be running in MinTTY without pseudo terminal support.")
+			fmt.Fprintln(stderr, "To learn about workarounds for this error, gh help mintty")
+			return exitError
+		}
+
 		var httpErr api.HTTPError
 		if errors.As(err, &httpErr) && httpErr.StatusCode == 401 {
 			fmt.Fprintln(stderr, "hint: try authenticating with `gh auth login`")

pkg/cmd/root/help_topic.go

@@ -6,6 +6,12 @@ import (
 )
 
 var HelpTopics = map[string]map[string]string{
+	"mintty": {
+		"short": "Information about using gh with MinTTY",
+		"long": heredoc.Doc(`
+			TODO
+		`),
+	},
 	"environment": {
 		"short": "Environment variables that can be used with gh",
 		"long": heredoc.Doc(`