AudioFlinger: Remove unnecessary friends

Remove obsolete TODOs, replace as needed with specific bug numbers.

Test: compiles
Bug: 288339104
Merged-In: Ied525f2f100203800f746239685e77b8e033618e
Change-Id: Ied525f2f100203800f746239685e77b8e033618e
diff --git a/services/audioflinger/Client.h b/services/audioflinger/Client.h
index cb507fe..142d384 100644
--- a/services/audioflinger/Client.h
+++ b/services/audioflinger/Client.h
@@ -16,7 +16,7 @@
 
 #pragma once
 
-// TODO(b/288339104) Move to nested namespace
+// TODO(b/291318727) Move to nested namespace
 namespace android {
 
 class AudioFlinger;