minor #104 add postgres in doc (zairigimad)

This PR was merged into the main branch.

Discussion
----------

add postgres in doc

| Q             | A
| ------------- | ---
| Bug fix?      | yes/no
| New feature?  | yes/no <!-- please update src/**/CHANGELOG.md files -->
| Docs?         | yes/no <!-- required for new features -->
| Issues        | Fix #... <!-- prefix each issue number with "Fix #", no need to create an issue if none exist, explain below instead -->
| License       | MIT

<!--
Replace this notice by a description of your feature/bugfix.
This will help reviewers and should be a good start for the documentation.

Additionally (see https://symfony.com/releases):
 - Always add tests and ensure they pass.
 - For new features, provide some code snippets to help understand usage.
 - Features and deprecations must be submitted against branch main.
 - Update/add documentation as required (we can help!)
 - Changelog entry should follow https://symfony.com/doc/current/contributing/code/conventions.html#writing-a-changelog-entry
 - Never break backward compatibility (see https://symfony.com/bc).
-->

Commits
-------

f4ecb05 add postgres in doc

Author: chr-hertel

src/store/doc/index.rst

@@ -49,6 +49,7 @@ Supported Stores
 * `MariaDB`_ (requires `ext-pdo`)
 * `MongoDB Atlas`_ (requires `mongodb/mongodb` as additional dependency)
 * `Pinecone`_ (requires `probots-io/pinecone-php` as additional dependency)
+* `Postgres`_ (requires `ext-pdo`)
 
 .. note::
 
@@ -90,4 +91,5 @@ This leads to a store implementing two methods::
 .. _`MariaDB`: https://mariadb.org/projects/mariadb-vector/
 .. _`MongoDB Atlas`: https://www.mongodb.com/atlas
 .. _`Pinecone`: https://www.pinecone.io/
+.. _`Postgres`: https://www.postgresql.org/about/news/pgvector-070-released-2852/
 .. _`GitHub`: https://github.com/symfony/ai/issues/16