wafd best practice metadata

Reviewed-by: vladimirvshivkov <vshivkovvladimir@gmail.com>
Co-authored-by: Hasko, Vladimir <vladimir.hasko@t-systems.com>
Co-committed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com>

otc_metadata/data/services.yaml

@@ -1141,6 +1141,14 @@ documents:
     service_type: wafd
     title: API Reference
     type: api-ref
+  - environment: internal
+    html_location: docs/wafd/best-practice
+    link: /web-application-firewall-dedicated/best-practice/
+    pdf_name: wafd-best-practice
+    rst_location: doc/best-practice/source
+    service_type: wafd
+    title: Best Practice
+    type: best-practice
   - hc_location: usermanual/dwaf
     html_location: docs/wafd/umn
     link: /web-application-firewall-dedicated/umn/