docs: clarify PHP module bundling for PHP 8.3 and 8.4

Add version-specific notes about modules bundled by default in newer PHP
versions. Explains that some modules (e.g., curl, zlib, sodium) may already
be enabled in PHP 8.4, helping users troubleshoot 'module not found' errors.

Signed-off-by: skjnldsv <skjnldsv@protonmail.com>

Author: skjnldsv

admin_manual/installation/php_configuration.rst

@@ -55,6 +55,17 @@ The following PHP modules **must** be installed and enabled for Nextcloud Server
 The `ctype`, `fileinfo`, and `OpenSSL` modules are generally included and enabled in PHP by default. Often
 some of the other required modules are automatically installed by OS distribution package managers.
 
+.. note::
+   **PHP Version-Specific Information:**
+
+   - **PHP 8.3 and 8.4:** Several modules are now bundled with PHP by default, such as `curl`, `zlib`, and others.
+     When upgrading to these versions, some modules that were previously optional may already be enabled. If you
+     encounter "module not found" errors when running standard package installation commands, the module may
+     already be bundled and enabled — verify this by using the module check command below.
+   - **Debian/Ubuntu packages:** Module availability varies by distribution version. If a listed module cannot be
+     found in your package manager, check the PHP documentation or your distribution's PHP module list to
+     confirm if the feature is bundled with your PHP version.
+
 **How to check if a module is enabled:**
 
 - Run ``php -m | grep -i <module_name>``. If you see output, the module is active.
@@ -80,6 +91,7 @@ These modules are not required, but are highly recommended to improve functional
 
 - `intl`: Fixes sorting of non-ASCII characters and improves language translation performance.
 - `sodium`: Provides Argon2 password hashing (needed if using PHP < 8.4 and PHP was built without `libargon2`).
+  Starting with PHP 8.0, `sodium` is usually enabled by default. In PHP 8.4, `sodium` is typically bundled.
 
     bcrypt will be used if Argon2 is unavailable, but if passwords were previously hashed with Argon2
     (such as when migrating an existing Nextcloud Server installation to a new server environment) and this