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Document advanced attachment options for incoming webhooks

Description

Add additional documentation for the "attachment" parameter accepted by incoming webhooks: https://github.com/mattermost/docs/blob/master/source/developer/webhooks-incoming.md#creating-integrations-using-incoming-webhooks

QA Test Steps

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Status

Mana

None

Assignee

Lindsay Brock

Reporter

Harrison Healey

Epic Link

None

Fix versions

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Mattermost Team

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Sprint

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Labels

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GitHub Issue

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