Docs: use language agnostic links to the PHP manual

Ref: https://www.php.net/urlhowto.php

Author: jrfnl

PHPCSUtils/Tokens/Collections.php

@@ -204,7 +204,7 @@ class Collections
      *
      * @since 1.0.0
      *
-     * @link https://www.php.net/manual/en/language.constants.predefined.php.
+     * @link https://www.php.net/language.constants.predefined
      *
      * @var array <int|string> => <int|string>
      */
@@ -287,7 +287,7 @@ class Collections
     /**
      * Tokens types used for "forwarding" calls within OO structures.
      *
-     * @link https://www.php.net/manual/en/language.oop5.paamayim-nekudotayim.php
+     * @link https://www.php.net/language.oop5.paamayim-nekudotayim
      *
      * @since 1.0.0
      *

PHPCSUtils/Utils/NamingConventions.php

@@ -24,10 +24,10 @@ class NamingConventions
     /**
      * Regular expression to check if a given identifier name is valid for use in PHP.
      *
-     * @link http://php.net/manual/en/language.variables.basics.php
-     * @link http://php.net/manual/en/language.constants.php
-     * @link http://php.net/manual/en/functions.user-defined.php
-     * @link http://php.net/manual/en/language.oop5.basic.php
+     * @link https://www.php.net/language.variables.basics
+     * @link https://www.php.net/language.constants
+     * @link https://www.php.net/functions.user-defined
+     * @link https://www.php.net/en/language.oop5.basic
      *
      * @since 1.0.0
      *

PHPCSUtils/Utils/Numbers.php

@@ -71,7 +71,7 @@ class Numbers
     /**
      * Regex to determine whether the contents of an arbitrary string represents a float.
      *
-     * @link https://www.php.net/manual/en/language.types.float.php
+     * @link https://www.php.net/language.types.float
      *
      * @since 1.0.0
      *

PHPCSUtils/Utils/Variables.php

@@ -38,7 +38,7 @@ class Variables
      *
      * @since 1.0.0
      *
-     * @link http://php.net/manual/en/reserved.variables.php
+     * @link http://php.net/reserved.variables
      *
      * @var array <string> => <bool>
      */