AutoArpa.replace -> populate_should_replace to match YamlProvider

docs/auto_arpa.md

@@ -14,9 +14,9 @@ Alternatively the value can be a dictionary with configuration options for the A
 ---
 manager:
   auto_arpa:
-    # Replace duplicate records rather than throw an error, default is False
-    # which throws an error
-    replace: False
+    # Whether duplicate records should replace rather than error
+    # (optiona, default False)
+    populate_should_replace: false
     # Explicitly set the TTL of auto-created records, default is 3600s, 1hr
     ttl: 1800
 ```