Remove return type extension for wp_link_pages (#249)

As documented, `wp_link_pages()` always returns a string. See lines 1039-L1042 in [wp-includes/post-template.php](https://github.com/WordPress/WordPress/blob/5cbec1348bf159844c572e4ff89043f4b95ca37a/wp-includes/post-template.php#L1039-L1042).

Author: IanDelMar

src/EchoKeyDynamicFunctionReturnTypeExtension.php

@@ -32,7 +32,6 @@ class EchoKeyDynamicFunctionReturnTypeExtension implements \PHPStan\Type\Dynamic
         'wp_dropdown_languages' => 0,
         'wp_dropdown_users' => 0,
         'wp_get_archives' => 0,
-        'wp_link_pages' => 0,
         'wp_list_authors' => 0,
         'wp_list_bookmarks' => 0,
         'wp_list_categories' => 0,
@@ -90,7 +89,6 @@ public function isFunctionSupported(FunctionReflection $functionReflection): boo
      * @see https://developer.wordpress.org/reference/functions/wp_dropdown_languages/
      * @see https://developer.wordpress.org/reference/functions/wp_dropdown_users/
      * @see https://developer.wordpress.org/reference/functions/wp_get_archives/
-     * @see https://developer.wordpress.org/reference/functions/wp_link_pages/
      * @see https://developer.wordpress.org/reference/functions/wp_list_authors/
      * @see https://developer.wordpress.org/reference/functions/wp_list_bookmarks/
      * @see https://developer.wordpress.org/reference/functions/wp_list_categories/

tests/data/echo_key.php

@@ -12,7 +12,6 @@
 assertType('void', wp_dropdown_languages());
 assertType('void', wp_dropdown_users());
 assertType('void', wp_get_archives());
-assertType('void', wp_link_pages());
 assertType('void', wp_list_authors());
 assertType('void', wp_list_bookmarks());
 assertType('void|false', wp_list_categories());
@@ -29,7 +28,6 @@
 assertType('void', wp_dropdown_languages($args));
 assertType('void', wp_dropdown_users($args));
 assertType('void', wp_get_archives($args));
-assertType('void', wp_link_pages($args));
 assertType('void', wp_list_authors($args));
 assertType('void', wp_list_bookmarks($args));
 assertType('void|false', wp_list_categories($args));
@@ -44,7 +42,6 @@
 assertType('void', wp_dropdown_languages($args));
 assertType('void', wp_dropdown_users($args));
 assertType('void', wp_get_archives($args));
-assertType('void', wp_link_pages($args));
 assertType('void', wp_list_bookmarks($args));
 assertType('void|false', wp_list_categories($args));
 
@@ -55,7 +52,6 @@
 assertType('string|void', wp_dropdown_languages($args));
 assertType('string', wp_dropdown_users($args));
 assertType('string|void', wp_get_archives($args));
-assertType('string', wp_link_pages($args));
 assertType('string', wp_list_authors($args));
 assertType('string', wp_list_bookmarks($args));
 assertType('string|false', wp_list_categories($args));
@@ -70,7 +66,6 @@
 assertType('string|void', wp_dropdown_languages($args));
 assertType('string', wp_dropdown_users($args));
 assertType('string|void', wp_get_archives($args));
-assertType('string', wp_link_pages($args));
 assertType('string', wp_list_bookmarks($args));
 assertType('string|false', wp_list_categories($args));
 
@@ -81,7 +76,6 @@
 assertType('string|void', wp_dropdown_languages($args));
 assertType('string|void', wp_dropdown_users($args));
 assertType('string|void', wp_get_archives($args));
-assertType('string|void', wp_link_pages($args));
 assertType('string|void', wp_list_authors($args));
 assertType('string|void', wp_list_bookmarks($args));
 assertType('string|void|false', wp_list_categories($args));
@@ -97,7 +91,6 @@
 assertType('void', wp_dropdown_languages($args));
 assertType('void', wp_dropdown_users($args));
 assertType('void', wp_get_archives($args));
-assertType('void', wp_link_pages($args));
 assertType('void', wp_list_authors($args));
 assertType('void', wp_list_bookmarks($args));
 assertType('void|false', wp_list_categories($args));
@@ -112,7 +105,6 @@
 assertType('void', wp_dropdown_languages($args));
 assertType('void', wp_dropdown_users($args));
 assertType('void', wp_get_archives($args));
-assertType('void', wp_link_pages($args));
 assertType('void', wp_list_authors($args));
 assertType('void', wp_list_bookmarks($args));
 assertType('void|false', wp_list_categories($args));
@@ -127,7 +119,6 @@
 assertType('void', wp_dropdown_languages($args));
 assertType('void', wp_dropdown_users($args));
 assertType('void', wp_get_archives($args));
-assertType('void', wp_link_pages($args));
 assertType('void', wp_list_authors($args));
 assertType('void', wp_list_bookmarks($args));
 assertType('void|false', wp_list_categories($args));
@@ -142,7 +133,6 @@
 assertType('string|void', wp_dropdown_languages($args));
 assertType('string', wp_dropdown_users($args));
 assertType('string|void', wp_get_archives($args));
-assertType('string', wp_link_pages($args));
 assertType('string', wp_list_authors($args));
 assertType('string', wp_list_bookmarks($args));
 assertType('string|false', wp_list_categories($args));
@@ -157,7 +147,6 @@
 assertType('string|void', wp_dropdown_languages($args));
 assertType('string', wp_dropdown_users($args));
 assertType('string|void', wp_get_archives($args));
-assertType('string', wp_link_pages($args));
 assertType('string', wp_list_authors($args));
 assertType('string', wp_list_bookmarks($args));
 assertType('string|false', wp_list_categories($args));
@@ -173,7 +162,6 @@
 assertType('string|void', wp_dropdown_languages($args));
 assertType('string|void', wp_dropdown_users($args));
 assertType('string|void', wp_get_archives($args));
-assertType('string|void', wp_link_pages($args));
 assertType('string|void', wp_list_authors($args));
 assertType('string|void', wp_list_bookmarks($args));
 assertType('string|void|false', wp_list_categories($args));
@@ -191,7 +179,6 @@
 assertType('string|void', wp_dropdown_languages($args));
 assertType('string|void', wp_dropdown_users($args));
 assertType('string|void', wp_get_archives($args));
-assertType('string|void', wp_link_pages($args));
 assertType('string|void', wp_list_authors($args));
 assertType('string|void', wp_list_bookmarks($args));
 assertType('string|void|false', wp_list_categories($args));