update generated release notes

Author: github-actions[bot]

product_docs/docs/postgres_for_kubernetes/preview/rel_notes/index.mdx

@@ -7,7 +7,7 @@ indexCards: none
 redirects:
   - ../release_notes
 navigation:
-  - 1.28.0-rc2_rel_notes
+  - 1_28_0-rc2_rel_notes
   - 1_27_1_rel_notes
   - 1_27_0_rel_notes
   - 1_26_2_rel_notes
@@ -134,7 +134,7 @@ The EDB Postgres for Kubernetes documentation describes the major version of EDB
 
 | Version | Release date | Upstream merges |
 |---|---|---|
-| [1.28.0-rc2](./1.28.0-rc2_rel_notes) | 07 Nov 2025 | Upstream [1.28.0-rc2](https://cloudnative-pg.io/documentation/preview/release_notes/v1.28/) |
+| [1.28.0-rc2](./1_28_0-rc2_rel_notes) | 07 Nov 2025 | Upstream [1.28.0-rc2](https://cloudnative-pg.io/documentation/preview/release_notes/v1.28/) |
 | [1.27.1](./1_27_1_rel_notes) | 24 Oct 2025 | Upstream [1.27.1](https://cloudnative-pg.io/documentation/1.27/release_notes/v1.27/) |
 | [1.27.0](./1_27_0_rel_notes) | 19 Aug 2025 | Upstream [1.27.0](https://cloudnative-pg.io/documentation/1.27/release_notes/v1.27/) |
 | [1.26.2](./1_26_2_rel_notes) | 24 Oct 2025 | Upstream [1.26.2](https://cloudnative-pg.io/documentation/1.26/release_notes/v1.26/) |