fix formatting of json blocks in examples.md

One of the json blocks did not properly close its backticks, so the following text blocks were being rendered as json.

Author: philherbert

docs/examples.md

@@ -185,7 +185,8 @@ This example is taken from the [Opioid Prescribing Support Implementation Guide]
       ]
     }
   }
-}```
+}
+```
 
 > CDS Service Response