Rename explanation JSON to body

Author: morrieinmaas

aries_cloudcontroller/controllers/proof.py

@@ -81,10 +81,10 @@ async def get_presentation_credentials(
 
     # Send a problem report for presentation exchange
     async def send_problem_report(self, pres_ex_id, explanation: str):
-        explanation_request = {"explain_ltxt": explanation}
+        body = {"explain_ltxt": explanation}
         return await self.admin_POST(
             f"{self.base_url}/records/{pres_ex_id}/problem-report",
-            json_data=explanation_request,
+            json_data=body,
         )
 
     # Sends a proof presentation