fix name of 1.4.0 relnotes topic in navigation

Author: josh-heyer

product_docs/docs/edb-postgres-ai/1.4/hybrid-manager/release_notes/index.mdx

@@ -3,7 +3,7 @@ title: Hybrid Manager Innovation Release Notes
 navTitle: Release Notes
 description: Release notes provides information on what is new in each release of Hybrid Manager.
 navigation:
-  - hm_2026.1.4.0_rel_notes
+  - hm_1.4.0_rel_notes
   - contributing_ir_releases
 indexCards: none
 deepToC: true