message: Minor spelling update
diff: @@ -186,7 +186,7 @@ build confidence in consistent application of the API guidelines to PRs.
  Adding new [extensions](REPO_LAYOUT.md#sourceextensions-layout) has a dedicated policy. Please
  see [this](./EXTENSION_POLICY.md) document for more information.
  -# Exernal dependency policy
  +# External dependency policy
  Adding new external dependencies has a dedicated policy. Please see [this](DEPENDENCY_POLICY.md)
  document for more information.
  