Update docs/commerce-manager/promotions-builder/creating-a-promotion-in-promotions-builder.mdx

Co-authored-by: dazadep <[email protected]>

Author: kaiyuancheng

docs/commerce-manager/promotions-builder/creating-a-promotion-in-promotions-builder.mdx

@@ -203,7 +203,7 @@ You can duplicate an existing promotion and reuse its details as required in a n
 
     The duplicated promotion opens. Make the necessary updates, then click **Create Promotion** to save the new promotion.
 
-## Editing custom fields in a promotion
+## Editing Custom Fields in a Promotion
 In order to use custom fields in Promotions Builder, you need to create flows in the store. See [Creating FLows](/docs/commerce-manager/flows/flows) for how to create flows. The **slug** value for promotions builder is **rule-promotions**.
 Once you have created the flows and field, then you can edit the custom fields in promotions builder.