Added wording to clarify scope of references (OAI#2435)

* Added wording to clarify scope of references

* Added wording based on conversations in OAI TSC Meeting

* Update versions/3.1.0.md

versions/3.1.0.md

@@ -2235,7 +2235,7 @@ description: Pets operations
 
 #### <a name="referenceObject"></a>Reference Object
 
-A simple object to allow referencing other components in the OpenAPI document, internally and externally.
+A simple object to allow referencing other objects in the OpenAPI document, internally and externally. Targets of a reference do not need to be contained in a components section and for external references, targets MAY exist within any compatible resource. Targets are subject to the same constraints as inline objects.
 
 ##### Fixed Fields
 Field Name | Type | Description