fixes worstRating & removes json from docs/

Author: Christian-MK

docs/orcfax-feeds/risk-ratings/centralized-review/fact-statement-datum.json

@@ -28,7 +28,7 @@
       "@type": "Rating",
       "author": "Xerberus",
       "ratingValue": "{AAA}",
-      "worstRating": "DDD",
+      "worstRating": "D",
       "bestRating": "AAA",
       "reviewAspect": "Risk"
     }