Minor changes

Author: javiereguiluz

reference/requirements.rst

@@ -3,35 +3,35 @@
 
 .. _requirements-for-running-symfony2:
 
-Requirements for Running Symfony 4
-==================================
-
-Symfony 4 requires **PHP 7.1.3** or higher to run, in addition to other minor
-requirements:
-
-PHP Extensions
-~~~~~~~~~~~~~~
-* The `Ctype`_ extension must be available
-* The `iconv`_ extension  must be available
-* The `JSON`_ extension must be available
-* The `PCRE`_ extension must be available (minimum version 8.0)
-* The `Session`_ extension must be available
-* The `SimpleXML`_ extension must be available
-* The `Tokenizer`_ extension must be available
-
-Please note that all these extensions are installed and enabled by default 
-in PHP 7+.
-
-Other Requirements
-~~~~~~~~~~~~~~~~~~
-* The cache directory must me writable by the web server
-* The logs directory must be writable by the web server
-
-Checking Requirements with Symfony Requirements Checker
--------------------------------------------------------
-To make things simple, Symfony provides a tool to quickly check if
-your system meets these requirements. In addition, the tool will
-also provide recommendations if applicable.
+Requirements for Running Symfony
+================================
+
+These are the technical requirements to run Symfony 4 applications:
+
+* **PHP version**: 7.1.3 or higher
+* **PHP extensions**: (all of them are installed and enabled by default in PHP 7+)
+
+  * `Ctype`_
+  * `iconv`_
+  * `JSON`_
+  * `PCRE`_
+  * `Session`_
+  * `SimpleXML`_
+  * `Tokenizer`_
+
+* **Writable directories**: (must be writable by the web server)
+
+  * The project's cache directory (``var/cache/`` by default, but the app can
+    :ref:`override the cache dir <override-cache-dir>`)
+  * The project's log directory (``var/log/`` by default, but the app can
+    :ref:`override the logs dir <override-logs-dir>`)
+
+Checking Requirements Automatically
+-----------------------------------
+
+To make things simple, Symfony provides a tool to quickly check if your system
+meets these requirements. In addition, the tool provides recommendations if
+applicable.
 
 Run this command to install the tool:
 
@@ -65,10 +65,10 @@ The requirements checker tool adds a script to your Composer configuration to
 check the requirements automatically. There's no need to execute any command; if
 there are any issues, you'll see them in the console output.
 
-.. _iconv: http://php.net/manual/en/book.iconv.php
-.. _JSON: http://php.net/manual/en/book.json.php
-.. _Session: http://php.net/manual/en/book.session.php
-.. _Ctype: http://php.net/manual/en/book.ctype.php
-.. _Tokenizer: http://php.net/manual/en/book.tokenizer.php
-.. _SimpleXML: http://php.net/manual/en/book.simplexml.php
-.. _PCRE: http://php.net/manual/en/book.pcre.php
+.. _`iconv`: https://php.net/book.iconv
+.. _`JSON`: https://php.net/book.json
+.. _`Session`: https://php.net/book.session
+.. _`Ctype`: https://php.net/book.ctype
+.. _`Tokenizer`: https://php.net/book.tokenizer
+.. _`SimpleXML`: https://php.net/book.simplexml
+.. _`PCRE`: https://php.net/book.pcre