Variable name nit pick key_doc -> key

Author: aclark4life

django_mongodb_backend/schema.py

@@ -512,13 +512,13 @@ def _get_data_key(
             raise ImproperlyConfigured(
                 f"Encrypted field {key_alt_name} detected but no key vault configured"
             )
-        key_doc = key_vault_collection.find_one({"keyAltNames": key_alt_name})
-        if not key_doc:
+        key = key_vault_collection.find_one({"keyAltNames": key_alt_name})
+        if not key:
             raise ValueError(
                 f"No key found in keyvault for keyAltName={key_alt_name}. "
                 "Run with '--create-data-keys' to create missing keys."
             )
-        return key_doc["_id"]
+        return key["_id"]
 
     def _get_encrypted_fields(
         self, model, create_data_keys=False, key_alt_name=None, path_prefix=None