Fix env.php code sample for message queue configuration

[jeff-matthews]

Purpose of this pull request

This pull request (PR) fixes an invalid env.php code sample for message queue configuration.

See internal ticket MC-32147 for details.

Affected DevDocs pages

• https://devdocs.magento.com/guides/v2.3/extension-dev-guide/message-queues/message-queues.html#override-topic-configuration

whatsnew
Fixed invalid env.php code sample for message queue configuration.

[dhorytskyi]

The provided code snippet is an example of final queue configuration.
Here is a part that relates only to switching from mysql to amqp for "product_action_attribute.update" queue:

'topics' => [
    'product_action_attribute.update' => [
        'publisher' => 'amqp-magento'
    ]
],
'config' => [
    'publishers' => [
        'product_action_attribute.update' => [
            'connections' => [
                'amqp' => [
                    'name' => 'amqp',
                    'exchange' => 'magento',
                    'disabled' => false
                ],
                'db' => [
                    'name' => 'db',
                    'disabled' => true
                ]
            ]
        ]
    ]
],
'consumers' => [
    'product_action_attribute.update' => [
        'connection' => 'amqp',
    ],
],

[dhorytskyi]

This section is named "Override topic configuration", but contains information only about switching from mysql to amqp. As for now we don't have more information about overriding other parameters, I suggest renaming this section.

[dobooth]

@dhorytskyi

[dhorytskyi]

Please remove the old config sample (lines 55-78)

[jeff-matthews]

running tests

[ghost]

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