bluetooth: README files updated to improve cross-linking.

device/bluetooth/test/README.md

Index: device/bluetooth/test/README.md
diff --git a/device/bluetooth/test/README.md b/device/bluetooth/test/README.md
index e71787c61705270056b91ef0a1051be0de2b6e33..70982e8943183c41929d06b2eaa93e97f8a35428 100644
--- a/device/bluetooth/test/README.md
+++ b/device/bluetooth/test/README.md
@@ -1,10 +1,12 @@
-# Testing
+# Bluetooth Testing
 
 Implementation of the Bluetooth component is tested via unittests. Client code
 uses Mock Bluetooth objects:
 
+
 ## Mojo Testing Interface Implementation
-See [//public/interfaces/test/README.md](//device/bluetooth/public/interfaces/test/README.md)
+
+See [bluetooth/public/interfaces/test](/device/bluetooth/public/interfaces/test)
 for details about the interface. The current implementation of this interface
 creates a fake implementation of the current non-mojo C++ Bluetooth interface.
 This interface is implemented across files with a "fake_" prefix.
@@ -12,6 +14,7 @@ This interface is implemented across files with a "fake_" prefix.
 Web Bluetooth remains its only client. Testing code would implement the service
 as needed for tests.*
 
+
 ## Cross Platform Unit Tests
 
 New feature development uses cross platform unit tests. This reduces test code
@@ -29,6 +32,7 @@ operating system APIs as possible.
 
 [More testing information](https://docs.google.com/document/d/1mBipxn1sJu6jMqP0RQZpkYXC1o601bzLCpCxwTA2yGA/edit?usp=sharing)
 
+
 ## Legacy Platform Specific Unit Tests
 
 Early code (Classic on most platforms, and Low Energy on BlueZ) was tested with