Change docs links to actual file extension (.md)

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

Change-Id: I248048ae1ada927c9bfb4ec7164c8047936a00dc
2 files changed
tree: 0a732d470a7a217de9b4a0f9934f2946fd98cb55
  1. src/
  2. .buckconfig
  3. .gitignore
  4. BUCK
  5. LICENSE