Docs: Add udev rules tip

Adds udev rules setup instructions to Linux prerequisite steps.

Change-Id: I069df00e552544fcf69833a8c9e3754acb5e7e18
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/93961
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
Reviewed-by: Chad Norvell <chadnorvell@google.com>
Pigweed-Auto-Submit: Armando Montanez <amontanez@google.com>
diff --git a/docs/getting_started.rst b/docs/getting_started.rst
index dc9af55..14ac10f 100644
--- a/docs/getting_started.rst
+++ b/docs/getting_started.rst
@@ -104,6 +104,15 @@
 installation of prerequisites beyond basics like ``git`` and
 ``build-essential`` (or the equivalent for your distro).
 
+.. inclusive-language: disable
+
+To flash devices using OpenOCD, you may need to extend your system udev rules
+at ``/etc/udev/rules.d/``. The OpenOCD repository has a good
+`example udev rules file <https://github.com/openocd-org/openocd/blob/master/contrib/60-openocd.rules>`_
+that includes many popular hardware debuggers.
+
+.. inclusive-language: enable
+
 **macOS**
 
 To start using Pigweed on MacOS, you'll need to install XCode. Download it