java link time error improve

Asked about error message including "against private API.Adjust
sdk_version", which is a bit hard to parse due to missing space. Also
tried to make error message less verbose, so that it is more clear what
to do, and fixed a grammar mistake.

Bug: N/A
Test: N/A
Change-Id: Ib9a30d86b5cb0e9b3b7d5576ecb9498a9b316042