chromebot recipe instructions missing a step (#26337)

dev/bots/README.md

@@ -77,16 +77,17 @@ The typical cycle for editing a recipe is:
 
 1. Make your edits (probably to files in
    `//chrome_infra/build/scripts/slave/recipes/flutter`).
-2. Update the tests. Run `build/scripts/slave/recipes.py --use-bootstrap test
+1. Update the tests. Run `build/scripts/slave/recipes.py --use-bootstrap test
    train` to update existing expected output to match the new output. Verify
    completely new test cases by altering the `GenTests` method of the recipe.
    The recipe is required to have 100% test coverage.
-3. Run `build/scripts/slave/recipes.py run flutter/<repo> slavename=<slavename>
+1. Run `build/scripts/slave/recipes.py run flutter/<repo> slavename=<slavename>
    mastername=client.flutter buildername=<buildername> buildnumber=1234` where `<repo>` is one
    of `flutter` or `engine`, and `slavename` and `buildername` can be looked up
    from the *Build Properties* section of a [recent
    build](https://build.chromium.org/p/client.flutter/one_line_per_build).
-4. Upload the patch (`git commit`, `git cl upload`) and send it to someone in
+1. To submit a CL, you need a local branch first (`git checkout -b [some branch name]`).
+1. Upload the patch (`git commit`, `git cl upload`) and send it to someone in
    the `recipes/flutter/OWNERS` file for review.
 
 ### Editing the client.flutter buildbot master