Merge pull request #6933 from kenjis/fix-docs-supported-db

docs: add references to supported databases

user_guide_src/source/database/configuration.rst

@@ -6,6 +6,9 @@ Database Configuration
     :local:
     :depth: 2
 
+.. note::
+    See :ref:`requirements-supported-databases` for currently supported database drivers.
+
 ***********
 Config File
 ***********

user_guide_src/source/intro/requirements.rst

@@ -2,12 +2,24 @@
 Server Requirements
 ###################
 
+.. contents::
+    :local:
+    :depth: 2
+
+***************************
+PHP and Required Extensions
+***************************
+
 `PHP <https://www.php.net/>`_ version 7.4 or newer is required, with the following PHP extensions are enabled:
 
   - `intl <https://www.php.net/manual/en/intl.requirements.php>`_
   - `mbstring <https://www.php.net/manual/en/mbstring.requirements.php>`_
   - `json <https://www.php.net/manual/en/json.requirements.php>`_
 
+***********************
+Optional PHP Extensions
+***********************
+
 The following PHP extensions should be enabled on your server:
 
   - `mysqlnd <https://www.php.net/manual/en/mysqlnd.install.php>`_ (if you use MySQL)
@@ -28,6 +40,12 @@ The following PHP extensions are required when you use PHPUnit:
    - `libxml <https://www.php.net/manual/en/libxml.requirements.php>`_ (if you use :doc:`TestResponse </testing/response>` class)
    - `xdebug <https://xdebug.org/docs/install>`_ (if you use ``CIUnitTestCase::assertHeaderEmitted()``)
 
+.. _requirements-supported-databases:
+
+*******************
+Supported Databases
+*******************
+
 A database is required for most web application programming.
 Currently supported databases are:
 

user_guide_src/source/tutorial/news_section.rst

@@ -14,7 +14,7 @@ Create a Database to Work with
 ******************************
 
 The CodeIgniter installation assumes that you have set up an appropriate
-database, as outlined in the :doc:`requirements </intro/requirements>`.
+database, as outlined in the :ref:`requirements <requirements-supported-databases>`.
 In this tutorial, we provide SQL code for a MySQL database, and
 we also assume that you have a suitable client for issuing database
 commands (mysql, MySQL Workbench, or phpMyAdmin).
@@ -54,7 +54,7 @@ Connect to Your Database
 The local configuration file, ``.env``, that you created when you installed
 CodeIgniter, should have the database property settings uncommented and
 set appropriately for the database you want to use. Make sure you've configured
-your database properly as described :doc:`here <../database/configuration>`::
+your database properly as described in :doc:`../database/configuration`::
 
     database.default.hostname = localhost
     database.default.database = ci4tutorial