Update the doc about apex_available

The default has changed.

Exempt-From-Owner-Approval: documentation change

Bug: 128708192
Bug: 149393721
Test: n/a
Change-Id: I91f36fc1fb5f2302deac8ee23bb847077b1281c9
diff --git a/android/apex.go b/android/apex.go
index 9195388..a4a5231 100644
--- a/android/apex.go
+++ b/android/apex.go
@@ -88,8 +88,7 @@
 	//
 	// "//apex_available:anyapex" is a pseudo APEX name that matches to any APEX.
 	// "//apex_available:platform" refers to non-APEX partitions like "system.img".
-	// Default is ["//apex_available:platform", "//apex_available:anyapex"].
-	// TODO(b/128708192) change the default to ["//apex_available:platform"]
+	// Default is ["//apex_available:platform"].
 	Apex_available []string
 
 	// Name of the apex variant that this module is mutated into