internal/wasmserveutil: fix comments

Author: hajimehoshi

internal/wasmserveutil/util.go

@@ -11,19 +11,24 @@ import (
 
 var reGoVersion = regexp.MustCompile(`^go(\d+)\.(\d+)(\.(\d+))?`)
 
+// WasmExecJSURL returns the URL of wasm_exec.js for the given Go version like 'go1.23.4'.
 func WasmExecJSURL(goVersion string) (string, error) {
-	// go.mod might have a version without `.0` like `go1.22`. This version might not work as a part of URL.
 	m := reGoVersion.FindStringSubmatch(goVersion)
 	if len(m) == 0 {
 		return "", fmt.Errorf("wasmserve: invalid Go version: %s", goVersion)
 	}
 	minor, _ := strconv.Atoi(m[2])
+
+	// go.mod might have a version without `.0` like `go1.22`. This version might not work as a part of URL.
 	if minor >= 22 && m[3] == "" {
 		goVersion += ".0"
 	}
+
+	// The directory name was changed from `misc` to `lib` at Go 1.23.
 	dir := "lib"
 	if minor <= 23 {
 		dir = "misc"
 	}
+
 	return fmt.Sprintf("https://go.googlesource.com/go/+/refs/tags/%s/%s/wasm/wasm_exec.js?format=TEXT", goVersion, dir), nil
 }