Update migrating.md

docs/guides/migrating.md

@@ -220,7 +220,7 @@ The Socket.io and Grant (oAuth) dependencies have been updated to their latest v
 
 ### Configuration
 
-The automatic environment variable substitution in `@feathersjs/configuration` was causing subtle and hard to issues. It has been removed to instead rely on the functionality already provided and battle tested by the underlying [node-config](https://github.com/lorenwest/node-config). To update your configuration:
+The automatic environment variable substitution in `@feathersjs/configuration` was causing subtle and hard to debug issues. It has been removed to instead rely on the functionality already provided and battle tested by the underlying [node-config](https://github.com/lorenwest/node-config). To update your configuration:
 
 - Relative paths are no longer relative to the configuration file, but instead to where the application runs. This normally (when running from the application folder) means that paths starting with `../` and `./` have to be replaced with `./` and `./config/`.
 - Configuration through environment variables should be included via the `NODE_CONFIG` JSON string or as [Custom Environment Variable support](https://github.com/lorenwest/node-config/wiki/Environment-Variables#custom-environment-variables). To use existing environment variables add the following configuration file in `config/custom-environment-variables.json` like this: