Fix documentation bug in SQLiteDatabase

The documentation incorrectly states that, "[insertWithOnConflict
returns] the primary key of the existing row if the input param
'conflictAlgorithm' = CONFLICT_IGNORE". Unfortunately, SQLite does
not provide such functionality.

Close: https://code.google.com/p/android/issues/detail?id=13045



Change-Id: Ife919c4dcf7bf703b692d338d1fb5844a532dd39
Signed-off-by: Steve Pomeroy <steve@staticfree.info>