[docs] merged kb and cleanup. warning: don't see the commit

erpnext/docs/user/manual/en/using-erpnext/articles/adding-attachments-to-outgoing-messages.md

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+<h1>Adding Attachments to Outgoing Messages</h1>
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+ERPNext has in-built file manage system. Click [here](https://erpnext.com/kb/tools/managing-attachments) to learn more on how attachments are managed in ERPNext.
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+If you have some files attached in your transaction (say Purchase Order), which needs to be emailed with Purchase Order details. When click on Email option, at the end of the Communication dialog box, you will find all the attachments listed with check-box option. You should check files which needs to be emailed as an attachment to recipient.
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+![Emailing Attachments]({{docs_base_url}}/assets/img/articles/$SGrab_422.png)
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+<!-- markdown -->