Update some places that mentioned the old update-packages --upgrade (#12218)
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 99fdf11..7823b66 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -71,10 +71,10 @@
Running the analyzer
--------------------
-When editing Flutter code, it's important to check the code with the analyzer. There are two
-main ways to run it. In either case you will want to run `flutter update-packages --upgrade`
-first, or you will get version conflict issues or bogus error messages about core clases like
-Offset from `dart:ui`.
+When editing Flutter code, it's important to check the code with the
+analyzer. There are two main ways to run it. In either case you will
+want to run `flutter update-packages` first, or you will get bogus
+error messages about core classes like Offset from `dart:ui`.
For a one-off, use `flutter analyze --flutter-repo`. This uses the `analysis_options_repo.yaml` file
at the root of the repository for its configuration.
