Need to Correct the placement of @global tag in some files (Documentation)

[shailu25]

@global tag placement is wrong in below files documentation, according to ​PHP Documentation Standards.

1. wp-admin/export.php
2. wp-includes/widgets/class-wp-nav-menu-widget.php
3. wp-includes/widgets.php
4. wp-includes/script-modules.php
5. wp-includes/post.php
6. wp-includes/functions.wp-styles.php
7. wp-includes/functions.wp-scripts.php
8. wp-includes/functions.php
9. wp-includes/feed.php
10. wp-includes/class-wp-locale.php

[SergeyBiryukov]

In 58200:

Docs: Correct the placement of @global tags in various files.

Follow-up to [6589], [8598], [10798], [25490], [25594], [31192], [31194], [35718], [37437], [44169], [44948], [45247], [56763], [56773], [57370], [57503].

Props shailu25.
Fixes #61295.

Thanks for the PR! Merged in r58200.