chore: fix invalid @var type for WP_HTML_Processor_State::$context_node

[justlevine]

Trac ticket: https://core.trac.wordpress.org/ticket/52217

This PR fixes the PHPDoc @var type used for WP_HTML_Processor_State::$context_node to "correctly" indicate that it is an array where the first item is a string and the second is an array.

"Correctly" in this context means recognized by IDEs and tooling and following preexisting code patterns for array shapes (e.g.

wordpress-develop/src/wp-includes/interactivity-api/class-wp-interactivity-api.php

Line 104 in 695476e

* @var array{attributes: array<string, string|bool>}|null

).

While this issue was surfaced via PHPStan in #7619 (trac: https://core.trac.wordpress.org/ticket/61175 ), it can be remediated independently of that ticket.

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[justlevine]

Closing, as this is deprecated in 6.8