message: [tools] fix clang-8 reference
diff: @@ -122,7 +122,7 @@ def checkTools():
  "Examples:\n"
  " export CLANG_FORMAT=clang-format-8.0.0\n"
  " export CLANG_FORMAT=/opt/bin/clang-format-8\n"
  - " export CLANG_FORMAT=/usr/local/opt/llvm@7/bin/clang-format".format(CLANG_FORMAT_PATH))
  + " export CLANG_FORMAT=/usr/local/opt/llvm@8/bin/clang-format".format(CLANG_FORMAT_PATH))
  buildifier_abs_path = lookPath(BUILDIFIER_PATH)
  if buildifier_abs_path:
  