Update release_notes README.md (#4345)

Add some troubleshooting help for `firebase deploy`

packages/devtools_app/lib/src/framework/release_notes/README.md

diff --git a/packages/devtools_app/lib/src/framework/release_notes/README.md b/packages/devtools_app/lib/src/framework/release_notes/README.md
index ea38bd1..52eabd9 100644
--- a/packages/devtools_app/lib/src/framework/release_notes/README.md
+++ b/packages/devtools_app/lib/src/framework/release_notes/README.md
@@ -14,12 +14,19 @@
 and replace `https://docs.flutter.dev` with `https://flutter-website-dt-staging.web.app` (line 2).
 
 Then run the following rom the `website/` directory:
-```dart
-make setup;
-DISABLE_TESTS=1 make build;
+```shell
+make setup
+```
+```shell
+DISABLE_TESTS=1 make build
+```
+```shell
 firebase deploy --project devtools-staging --only hosting
 ```
 
+If the firebase command gives an authentication error, try running `firebase logout` and `firebase login`,
+and then retry the `firebase deploy` command.
+
 Once you see this message, the deployment was successful and now you can move on to the next step.
 ```shell
 ...
@@ -45,4 +52,4 @@
 Serving DevTools with a local devtools server...
 Serving DevTools at http://127.0.0.1:57336.
 ```
-Visit the DevTools link, and verify that the release notes viewer displays the new release notes as expected.
\ No newline at end of file
+Visit the DevTools link, and verify that the release notes viewer displays the new release notes as expected.