Update description of overview pages

Author: Mirage20

docs/overview/architecture.md

@@ -1,6 +1,6 @@
 ---
 title: Architecture
-description: Explore OpenChoreo's multi-plane architecture with Control, Data, Build, and Observability planes.
+description: Explore how OpenChoreo is architected across control, data, CI, and observability planes, and how these components work together to deliver a comprehensive Internal Developer Platform.
 ---
 
 # OpenChoreo Architecture

docs/overview/what-is-openchoreo.mdx

@@ -1,7 +1,7 @@
 ---
 title: What is OpenChoreo
 slug: /
-description: OpenChoreo is an open-source IDP that transforms Kubernetes into a self-service platform with CI/CD, API management, and built-in observability.
+description: "Introduction to OpenChoreo: an open-source Internal Developer Platform (IDP) that helps platform teams deliver scalable, self-service developer experiences on Kubernetes."
 ---
 
 import Link from '@docusaurus/Link';