Update recipes index and README

Author: actions-user

docs/recipes/index.json

@@ -1175,7 +1175,7 @@
     "file": "null-support.md",
     "title": "Null Support",
     "path": "/docs/recipes/null-support.md",
-    "hash": "b4dd0f83b1c141168f707bded609f811",
+    "hash": "9605de66b50071c3192dda054169d911",
     "keywords": [
       "Null support",
       "null keyword",