The documentation (README.md and index.md) referred to the public headers using an incorrect path - fixing. PiperOrigin-RevId: 252922925
------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=197452015
Markdown is more readable in a text editor and when hosted on GitHub is more readable than HTML. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=148830423
