Fix KNOWN_CODENAMES javadoc to mention that all codenames are there.

Bug: 220153433
Test: atest BuildTest
Change-Id: I93cade7cb11e34557445b74d1e1841508061d616
Merged-In: I93cade7cb11e34557445b74d1e1841508061d616
(cherry picked from commit 82d33f26f940b3c96904395f65f680683d9c76ac)
diff --git a/core/java/android/os/Build.java b/core/java/android/os/Build.java
index 45cc324d..394e7c3 100755
--- a/core/java/android/os/Build.java
+++ b/core/java/android/os/Build.java
@@ -406,7 +406,7 @@
         public static final String CODENAME = getString("ro.build.version.codename");
 
         /**
-         * All known codenames starting from {@link VERSION_CODES.Q}.
+         * All known codenames that are present in {@link VERSION_CODES}.
          *
          * <p>This includes in development codenames as well, i.e. if {@link #CODENAME} is not "REL"
          * then the value of that is present in this set.