docs: fix README anchor for Optional Extra Class Annotations

Author: barissayli

customer-service-client/README.md

@@ -497,7 +497,8 @@ It enqueues responses for **all CRUD operations** and asserts correct mapping in
 
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-### ⚙️ Optional: Extra Class Annotations
+### Optional: Extra Class Annotations
+*(⚙️ advanced feature — use only if needed)*
 
 The generator also supports an **optional vendor extension** to attach annotations directly on top of the generated
 wrapper classes.

customer-service/README.md

@@ -229,8 +229,7 @@ mvn test
 * Focused on clarity and minimal setup.
 * Optional: You can attach extra annotations (e.g., Jackson) to generated wrapper classes by setting  
   `app.openapi.wrapper.class-extra-annotation` in `application.yml`.  
-  See [customer-service-client README](../customer-service-client/README.md#-optional-extra-class-annotations) for
-  details.
+  See [customer-service-client README](../customer-service-client/README.md#optional-extra-class-annotations) for details.
 
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