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)
1 file changed