[Task] Update docs to include Account Payment Handler

[denistsoi]

Task

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Overview

Update docs to include Account Payment Handler (and a easy-to-understand phrase like "How to send coins programmatically")

Behavior

A description of how the contributor's work should behave.

/* code examples are awesome */

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f855a1e91674afb4bf2466b2c8e1de320d48c31e95750f5c80c0f5de07279bc2

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