CDD: Update guidance for audio output on Android Watch devices

The previous guidance that discouraged audio output is obsolete.
This change is inline with developer expectation for Wear:
https://developer.android.com/training/wearables/wearable-sounds

Test: N/A
Bug: 156074600
Change-Id: I286446b1fb4e04e69559d65ed9aabc3823854822
diff --git a/2_device-types/2_4_watch-reqs.md b/2_device-types/2_4_watch-reqs.md
index 64c35a6..0f60070 100644
--- a/2_device-types/2_4_watch-reqs.md
+++ b/2_device-types/2_4_watch-reqs.md
@@ -56,7 +56,7 @@
 
 *   [[7.8](#7_8_audio).1/W-0-1] MUST include a microphone.
 
-*   [[7.8](#7_8_audio).2/W] MAY but SHOULD NOT have audio output.
+*   [[7.8](#7_8_audio).2/W] MAY have audio output.
 
 ### 2.4.2\. Multimedia