Reland: Reword flutter run help screen. (#48423)

diff --git a/AUTHORS b/AUTHORS
index e0972f1..bfc7c6f 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -49,3 +49,4 @@
 Jefferson Quesado <jeff.quesado@gmail.com>
 Mark Diener <rpzrpzrpz@gmail.com>
 Alek Åström <alek.astrom@gmail.com>
+Efthymios Sarpmpanis <e.sarbanis@gmail.com>