Add note cautioning against direct import of _local_context.
Add note cautioning against direct import of _local_context.

Directly importing _local_context may result in a reference to the wrong
object being returned if it is imported before being initialized.

Workiva/furious,mattsanders-wf/furious,rosshendrickson-wf/furious,Workiva/furious,andreleblanc-wf/furious,robertkluin/furious,andreleblanc-wf/furious,mattsanders-wf/furious,beaulyddon-wf/furious,rosshendrickson-wf/furious,beaulyddon-wf/furious