[Misc] Various small fixes

[mnocon]

Target: 4.6, 5.0

A small batch of fixes I found when browsing the doc.

[mnocon]

This API has been removed in 3.3

[github-actions]

Preview of modified files

Preview of modified Markdown:

• docs/api/event_reference/event_reference.md
• docs/api/php_api/php_api.md
• docs/cdp/cdp_installation.md
• docs/commerce/order_management/configure_order_management.md
• docs/commerce/payment/configure_payment.md
• docs/commerce/shipping_management/configure_shipment.md
• docs/commerce/transactional_emails/transactional_emails.md
• docs/getting_started/troubleshooting.md
• docs/tutorials/generic_field_type/3_create_form_for_point2d.md

[adriendupuis]

Could it be 4.6.21? (You can event edit the code w/ browser console if you don't want to update your current install :p)

[mnocon]

I've decided to cheat a bit more: 3b795c8

I see no value in having the exact version there, as long it says 4.6 (and it means less maintanence for us)

[github-actions]

code_samples/ change report

Before (on target branch)	After (in current PR)
code_samples/api/public_php_api/src/EventSubscriber/MyEventSubcriber.php	code_samples/api/public_php_api/src/EventSubscriber/MyEventSubcriber.php
	docs/api/event_reference/event_reference.md@15:``` php docs/api/event_reference/event_reference.md@16:[[= include_file('code_samples/api/public_php_api/src/EventSubscriber/MyEventSubcriber.php') =]] docs/api/event_reference/event_reference.md@17:``` 001⫶<?php declare(strict_types=1); 002⫶ 003⫶namespace App\EventSubscriber; 004⫶ 005⫶use Ibexa\Contracts\Core\Repository\Events\Content\CopyContentEvent; 006⫶use Symfony\Component\EventDispatcher\EventSubscriberInterface; 007⫶ 008⫶class MyEventSubcriber implements EventSubscriberInterface 009⫶{ 010⫶ public static function getSubscribedEvents() 011⫶ { 012⫶ return [ 013⫶ CopyContentEvent::class => ['onCopyContent', 0], 014⫶ ]; 015⫶ } 016⫶ 017⫶ public function onCopyContent(CopyContentEvent $event): void 018⫶ { 019⫶ // your implementation 020⫶ } 021⫶}

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