Docs: Replace @see with @link for URLs in block-library package.

[huzaifaalmesbah]

Why this change?

To align with the WordPress PHP Inline Documentation Standards, proper tag usage distinguishes between internal code references and external links:

• When to use @see: accurately references a function, method, class, or variable within the codebase (e.g., @see WP_Query::get_posts()).
• When to use @link: accurately references a URL, such as external documentation, Trac tickets, GitHub issues, or specifications.

This PR corrects instances in packages/block-library where @see was incorrectly used to point to external URLs.

Description

Replaced incorrect @see tags with @link tags in the following files:

• packages/block-library/src/comments/index.php
• packages/block-library/src/gallery/index.php
• packages/block-library/src/list/index.php
• packages/block-library/src/loginout/index.php
• packages/block-library/src/post-navigation-link/index.php
• packages/block-library/src/query-pagination-numbers/index.php

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