Change docs links to actual file extension (.md)

See https://gerrit-review.googlesource.com/83950 for detailed context.

Change-Id: I425285fc81404d49629bf2f468f45c3fc67dd8f9
1 file changed
tree: 23fe8bccd7e67c25189a54c6c73ad403e1c19115
  1. .gitignore
  2. BUCK
  3. LICENSE
  4. src/