Fix doc/note/auto-formatting.md typo
# Auto-Formatting
Within this repository:
-- `C` code is formatted by `clang-format-5.0 -style=Chromium"`.
+- `C` code is formatted by `clang-format-5.0 -style=Chromium`.
- `Go` code is formatted by `gofmt`.
- `Wuffs` code is formatted by [`wuffsfmt`](/cmd/wuffsfmt).
