Update percona extensions with feedback and the oidc extension

Author: Andriciuc

docs/percona-ext.md

@@ -9,20 +9,26 @@ This page provides a high-level overview of the available Percona-authored exten
 
 ## :octicons-graph-16: pg_stat_monitor
 
-A query performance monitoring tool for PostgreSQL that brings more insight and details around query performance, planning statistics and metadata. It improves observability, enabling users to debug and tune query performance with precision.
+An open-source query performance monitoring tool for PostgreSQL that brings more insight and details around query performance, planning statistics and metadata. It improves observability, enabling users to debug and tune query performance with precision.
 
-[pg_stat_monitor documentation :octicons-link-external-16:](https://docs.percona.com/pg-stat-monitor/index.html){.md-button}
+[See the pg_stat_monitor documentation :octicons-link-external-16:](https://docs.percona.com/pg-stat-monitor/index.html){.md-button}
 </div>
 
 <div data-banner markdown>
 
 ## :material-file-key-outline: pg_tde
 
-An open-source extension designed to enhance PostgreSQL’s security by encrypting data files on disk. The encryption is transparent for users, allowing them to access and manipulate data without managing encryption details.
+An open-source extension designed to enhance PostgreSQL security by encrypting data files on disk. `pg_tde` protects data at rest by ensuring that database files cannot be read without the appropriate encryption keys. Encryption is transparent to applications and users at the SQL level, while key management is configured separately.
 
-You can also use `pg_tde` to enforce encryption at the database level, ensuring that all newly created data is encrypted without requiring per-table changes.
+[See the pg_tde documentation :octicons-link-external-16:](https://docs.percona.com/pg-tde/index.html){.md-button}
 
-[For configuration details, see the pg_tde documentation. :octicons-link-external-16:](https://docs.percona.com/pg-tde/index.html){.md-button}
+## :material-file-key-outline: pg_oidc_validator
+
+An **experimental** OAuth validator library for PostgreSQL 18 that validates OpenID Connect (OIDC) JWT access tokens. It integrates with PostgreSQL’s OAuth framework to verify tokens issued by compliant OIDC providers.
+
+**NOTE:** This library is still experimental and not intended for production use.
+
+[Check the pg_oidc_validator GitHub repository :octicons-link-external-16:](https://github.com/Percona-Lab/pg_oidc_validator){.md-button}
 
 </div>
 </div>