[docs] Refresh dev/bots/README.md (#113464)

dev/bots/README.md

diff --git a/dev/bots/README.md b/dev/bots/README.md
index 20e8102..a610b57 100644
--- a/dev/bots/README.md
+++ b/dev/bots/README.md
@@ -7,8 +7,6 @@
   - Aggregate dashboard of the separate CI systems used by Flutter.
 * https://cirrus-ci.com/github/flutter/flutter/master
   - Testing is done on PRs and submitted changes on GitHub.
-* https://ci.chromium.org/p/flutter/
-  - Additional testing and processing are done after changes are submitted.
 
 Flutter infra requires special permissions to retrigger builds on the
 [build dashboard](https://flutter-dashboard.appspot.com/#/build). File an
@@ -22,16 +20,16 @@
 For tagged dev and beta builds, it also builds and deploys the gallery app to
 the app stores. It is configured by the [.cirrus.yml](/.cirrus.yml).
 
-We also have post-commit testing with actual devices, in what we call our
-[devicelab](../devicelab/README.md).
+The build dashboard includes post-commit testing run on physical devices. See
+[//dev/devicelab](../devicelab/README.md) for more information.
 
 ## LUCI (Layered Universal Continuous Integration)
 
-A [set of recipes](https://flutter.googlesource.com/recipes/)
-are run on Windows, Linux, and Mac machines. The configuration for how many
+A [set of infra scripts](https://flutter.googlesource.com/recipes/)
+run on Windows, Linux, and Mac machines. The configuration for how many
 machines and what kind are managed internally by Google. File an
 [infra ticket](https://github.com/flutter/flutter/wiki/Infra-Ticket-Queue)
-if you suspect changes are needed there. Both of these technologies are highly
+to request new machine types to be added. Both of these technologies are highly
 specific to the [LUCI](https://github.com/luci) project, which is the successor
 to Chromium's infra and the foundation to Flutter's infrastructure.
 
@@ -56,23 +54,6 @@
 - If you're running into `gsutil` permission issues, check with @Hixie to make sure
   you have the right push permissions.
 
-### Getting the code
-
-The following will get way more than just recipe code, but it _will_ get the
-recipe code:
-
-```bash
-mkdir chrome_infra
-cd chrome_infra
-fetch infra
-```
-
-More detailed instructions can be found [here](https://chromium.googlesource.com/infra/infra/+/master/doc/source.md).
-
-Most of the functionality for recipes comes from `recipe_modules`, which are
-unfortunately spread to many separate repositories.  After checking out the code
-search for files named `api.py` or `example.py` under `infra/build`.
-
 ### Editing a recipe
 
 Flutter has several recipes depending on the test. The recipes share common
@@ -92,7 +73,7 @@
    the 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.
-4. Run `led get-builder 'luci.flutter.prod:BUILDER_NAME' | led edit -p 'revision="GIT_HASH"' | led edit-recipe-bundle | led launch`, where `BUILDER_NAME` is the builder name (e.g. `Linux Engine`), and
+4. Run `led get-builder 'luci.flutter.staging:BUILDER_NAME' | led edit -p 'revision="GIT_HASH"' | led edit-recipe-bundle | led launch`, where `BUILDER_NAME` is the builder name (e.g. `Linux Engine`), and
    `GIT_HASH` is the hash to build (which is important for the engine but not
    for the framework).
    * If `led` fails, ensure that your `depot_tools` checkout is up to date.
@@ -100,19 +81,6 @@
 6. Upload the patch (`git commit`, `git cl upload`), and open the outputted URL to the CL.
 7. Use "Find owners" to get reviewers for the CL
 
-
-### The infra config repository
-
-The [infra](https://flutter.googlesource.com/infra/+/refs/heads/main) repository contains
-configuration files for the dashboard, builder groups, scheduling, and
-individual builders. Edits to this may require changes other internal Google
-repositories - e.g., to change the operating system or number of machines. If
-you want to do that, file an [infra ticket](https://github.com/flutter/flutter/wiki/Infra-Ticket-Queue)
-with your proposed changes.
-
-Each configuration file in that repository has a link in the top comments to a
-schema that describes available properties.
-
 ### Android Tools
 
 The Android SDK and NDK used by Flutter's Chrome infra bots are stored in Google