chore: fix a typo

d2cli/main.go

@@ -50,7 +50,7 @@ import (
 func Run(ctx context.Context, ms *xmain.State) (err error) {
 	ctx = log.WithDefault(ctx)
 	// These should be kept up-to-date with the d2 man page
-	watchFlag, err := ms.Opts.Bool("D2_WATCH", "watch", "w", false, "watch for changes to input and live reload. Use $HOST and $PORT to specify the listening address.\n(default localhost:0, which is will open on a randomly available local port).")
+	watchFlag, err := ms.Opts.Bool("D2_WATCH", "watch", "w", false, "watch for changes to input and live reload. Use $HOST and $PORT to specify the listening address.\n(default localhost:0, which will open on a randomly available local port).")
 	if err != nil {
 		return err
 	}