message: Remove a line about deep cloning from monkey-patching locale guide
diff: @@ -743,7 +743,6 @@ export default locale
  ### Simple example
  Adding and replacing `format` tokens is easy with [`formatters`](#formatters) property of the locale.
  -Deep clone the locale before monkey-patching to prevent mutability conflicts.
  ```javascript
  import merge from 'lodash/merge'
  