Get rid of //aos/prime

It's not a useful distinction to make any more.

Change-Id: Ieacfe8af4502108b8a5949234a1a3b6a6dd7b7e9
diff --git a/aos/common/debugging-tips.txt b/aos/common/debugging-tips.txt
index b9a50f3..9bbe8d3 100644
--- a/aos/common/debugging-tips.txt
+++ b/aos/common/debugging-tips.txt
@@ -23,7 +23,7 @@
 [Control Loop(s) Not Working]
 Are robot_state messages going out? An aos::JoystickInput (often
   joystick_reader) should be sending them.
-  Also, kFakeJoysticks in aos/prime/input/joystick_reader.cc has to be set to
+  Also, kFakeJoysticks in aos/input/joystick_reader.cc has to be set to
     false in order for anything to get output.
 Is it being fed goal messages?
 Is it getting position messages?