update docs

docs/webhooks/form-webhook.md

@@ -146,6 +146,10 @@ During the form filling and signing process, 3 types of events may occur and are
             "type": "string",
             "description": "The submission URL."
           },
+          "variables": {
+            "type": "object",
+            "description": "Dynamic content variables object."
+          },
           "created_at": {
             "type": "string",
             "description": "The submission creation date.",

docs/webhooks/submission-webhook.md

@@ -216,6 +216,10 @@ Get submission creation, completion, expiration, and archiving notifications usi
           }
         }
       },
+      "variables": {
+        "type": "object",
+        "description": "Dynamic content variables object."
+      },
       "created_by_user": {
         "type": "object",
         "properties": {