cmd/go2ts: fix typo

It is now an ex-🍁.
diff --git a/cmd/go2ts/go2ts.go b/cmd/go2ts/go2ts.go
index 0a55b7c..f7d773f 100644
--- a/cmd/go2ts/go2ts.go
+++ b/cmd/go2ts/go2ts.go
@@ -1,7 +1,7 @@
 // A command line tool for generating typescript type declarations from go
 // struct types.
 //
-// Exmaple:
+// Example:
 //
 //	go run ./cmd/go2ts -o webui/src/types.ts
 package main