doc/start_pup: update chrome download link

A new dev build was released for all platforms yesterday with the required patches.

doc/api/start_pup.rst

@@ -28,7 +28,7 @@ Make sure that Bluetooth is enabled on your device and go to
 `code.pybricks.com`_. That's it!
 
 Right now, we officially support only **Google Chrome, version 85 or newer**.
-It is currently available as a nightly build. Download it `from here`_.
+It is currently available as a weekly developer build. Download it `from here`_.
 The official Chrome 85 release is
 scheduled for August 25th. You can install it on Windows, Mac, and Linux
 without affecting your existing browser or data.
@@ -36,9 +36,9 @@ without affecting your existing browser or data.
 .. toggle-header::
     :header: **Extra steps for Linux users**
 
-    - For now, install the `developer version`_ debian package.
     - In Google Chrome go to ``chrome://flags/``.
     - Search for *Experimental Web Platform features* and enable it.
+    - Flashing firmware will be slow if you have BlueZ < v5.51.
 
 Installing the Pybricks firmware
 --------------------------------
@@ -170,5 +170,4 @@ try again with fresh batteries.
 .. _latest builds: https://github.com/pybricks/pybricks-micropython/actions?query=workflow%3ABuild+
 .. _support page: https://github.com/pybricks/support/issues/
 .. _code.pybricks.com: http://code.pybricks.com/
-.. _from here: https://www.google.com/chrome/canary/
-.. _developer version: https://www.google.com/chrome/dev/
+.. _from here: https://www.google.com/chrome/dev/