Fix ref handling in Parameter examples

Author: andurairaj

modules/swagger-parser-v3/src/main/java/io/swagger/v3/parser/processors/ExternalRefProcessor.java

@@ -838,6 +838,9 @@ public String processRefToExternalParameter(String $ref, RefFormat refFormat) {
             if(parameter.getSchema() != null){
                 processRefSchemaObject(parameter.getSchema(), $ref);
             }
+            if(parameter.getExamples() != null) {
+               processRefExamples(parameter.getExamples(), $ref);
+            }
         }
 
         return newRef;