docs: remove xml extention

We do not use it.
https://www.php.net/manual/en/book.xml.php

Author: kenjis

README.md

@@ -92,7 +92,6 @@ PHP version 7.4 or higher is required, with the following extensions installed:
 Additionally, make sure that the following extensions are enabled in your PHP:
 
 - json (enabled by default - don't turn it off)
-- xml (enabled by default - don't turn it off)
 - [mysqlnd](http://php.net/manual/en/mysqlnd.install.php) if you plan to use MySQL
 - [libcurl](http://php.net/manual/en/curl.requirements.php) if you plan to use the HTTP\CURLRequest library
 

admin/framework/README.md

@@ -50,6 +50,5 @@ PHP version 7.4 or higher is required, with the following extensions installed:
 Additionally, make sure that the following extensions are enabled in your PHP:
 
 - json (enabled by default - don't turn it off)
-- xml (enabled by default - don't turn it off)
 - [mysqlnd](http://php.net/manual/en/mysqlnd.install.php) if you plan to use MySQL
 - [libcurl](http://php.net/manual/en/curl.requirements.php) if you plan to use the HTTP\CURLRequest library

admin/starter/README.md

@@ -58,6 +58,5 @@ PHP version 7.4 or higher is required, with the following extensions installed:
 Additionally, make sure that the following extensions are enabled in your PHP:
 
 - json (enabled by default - don't turn it off)
-- xml (enabled by default - don't turn it off)
 - [mysqlnd](http://php.net/manual/en/mysqlnd.install.php) if you plan to use MySQL
 - [libcurl](http://php.net/manual/en/curl.requirements.php) if you plan to use the HTTP\CURLRequest library