Update index.mdx

Author: jpe442

advocacy_docs/supported-open-source/warehousepg/observability/index.mdx

@@ -1,6 +1,6 @@
 ---
 title: WarehousePG Observability
-description: Covers the usage WarehousePG Observability as a centralized monitoring hub for your existing WarehousePG cluster.
+description: Covers the usage of WarehousePG Observability as a centralized monitoring hub for your existing WarehousePG cluster.
 navigation:
 - release_notes
 - overview