Document extension changes for Bref v3

docs/environment/php.mdx

@@ -73,6 +73,7 @@ The following extensions are installed and enabled by default in Bref runtimes:
     <li><a className="underline" href="https://www.php.net/manual/en/book.pdo.php">PDO</a></li>
     <li><a className="underline" href="https://www.php.net/manual/en/ref.pdo-sqlite.php">pdo_sqlite</a></li>
     <li><a className="underline" href="https://www.php.net/manual/en/ref.pdo-mysql.php">pdo_mysql</a></li>
+    <li><a className="underline" href="https://www.php.net/manual/en/ref.pdo-pgsql.php">pdo_pgsql</a></li>
     <li><a className="underline" href="https://www.php.net/manual/en/book.phar.php">Phar</a></li>
     <li><a className="underline" href="https://www.php.net/manual/en/book.posix.php">posix</a></li>
     <li><a className="underline" href="https://www.php.net/manual/en/book.readline.php">readline</a></li>
@@ -98,14 +99,16 @@ The following extensions are installed in Bref runtimes, but disabled by default
 
 - **[intl](https://www.php.net/manual/en/intro.intl.php)** - Internationalization extension (referred as Intl) is a wrapper for ICU library, enabling PHP programmers to perform various locale-aware operations.
 - **[APCu](https://www.php.net/manual/en/intro.apcu.php)** - APCu is APC stripped of opcode caching.
-- **[PostgreSQL PDO Driver](https://www.php.net/manual/en/ref.pdo-pgsql.php)** -  PDO_PGSQL is a driver that implements the PHP Data Objects (PDO) interface to enable access from PHP to PostgreSQL databases.
+- **[Redis](https://github.com/phpredis/phpredis)** - A PHP extension for interfacing with Redis.
+- **[soap](https://www.php.net/manual/en/book.soap.php)** - SOAP client and server for PHP
 
 You can enable these extensions by loading them in `php/conf.d/php.ini` (as mentioned in [the section above](#phpini)), for example:
 
 ```ini filename="php/conf.d/php.ini"
 extension=intl
 extension=apcu
-extension=pdo_pgsql
+extension=redis
+extension=soap
 ```
 
 ### Extra extensions