Docs: Systematically add missing @global annotations for global variables

**Trac Ticket:** https://core.trac.wordpress.org/ticket/64224

**Why this change?**

This change adds missing @global documentation tags to functions in
- src/wp-admin/includes/misc.php
- src/wp-admin/includes/template.php
- src/wp-admin/includes/schema.php
- src/wp-admin/install.php

This aligns the codebase with the WordPress PHP Documentation Standards, ensuring that global variables used within functions are properly documented for better static analysis and code clarity.

Files Changed:
- src/wp-admin/includes/misc.php
- src/wp-admin/includes/template.php
- src/wp-admin/includes/schema.php
- src/wp-admin/install.php

Author: noruzzamans

src/wp-admin/includes/misc.php

@@ -492,6 +492,9 @@ function wp_make_plugin_file_tree( $plugin_editable_files ) {
  * @since 4.9.0
  * @access private
  *
+ * @global string $file   Path to the file being edited.
+ * @global string $plugin Path to the plugin file relative to the plugins directory.
+ *
  * @param array|string $tree  List of file/folder paths, or filename.
  * @param string       $label Name of file or folder to print.
  * @param int          $level The aria-level for the current iteration.

src/wp-admin/includes/schema.php

@@ -12,8 +12,8 @@
  * Declare these as global in case schema.php is included from a function.
  *
  * @global wpdb   $wpdb            WordPress database abstraction object.
- * @global array  $wp_queries
- * @global string $charset_collate
+ * @global array  $wp_queries      Global database queries array.
+ * @global string $charset_collate Database charset and collation.
  */
 global $wpdb, $wp_queries, $charset_collate;
 

src/wp-admin/includes/template.php

@@ -1628,6 +1628,8 @@ function do_accordion_sections( $screen, $context, $data_object ) {
  *     @type string $after_section  HTML content to append to the section's HTML output. Default empty.
  *     @type string $section_class  The class name to use for the section. Default empty.
  * }
+ *
+ * @global array $wp_settings_sections Global settings sections array.
  */
 function add_settings_section( $id, $title, $callback, $page, $args = array() ) {
 	global $wp_settings_sections;

src/wp-admin/install.php

@@ -342,6 +342,7 @@ function display_setup_form( $error = null ) {
 /**
  * @global string    $wp_local_package Locale code of the package.
  * @global WP_Locale $wp_locale        WordPress date and time locale object.
+ * @global wpdb      $wpdb             WordPress database abstraction object.
  */
 $language = '';
 if ( ! empty( $_REQUEST['language'] ) ) {