Adds step where deposit refund takes place

[stephenrichter]

A few new users (including myself) have not understood when the deposit was actually refunded.

This PR adds a single line to explain the stage at which the deposit is refunded.
Further questions about the deposit refund can be included in the FAQ.

Can someone from the team please confirm how deposit refund works when the deposit has been crowdfunded?

[eccentricexit]

When the deposit (or any appeal fees for that matter) are crowdfunded, the fees must be claimed after the request resolves via the withdrawFeesAndRewards function.

Currently, the kleros cooperative subsidizes this part of the flow to improve the UX via a bot that calls this for users, so as a rule of thumb users don't have to do anything (except wait) to get their deposits back. However there is one important thing to note:

The returned deposit will not show up in the transactions section on etherscan. Instead, users should look for it inside the internal transactions tab.

If you withdrawable fees and don't want to wait for the bot, there is a button in the UI that will show up under settings (gear on the top right).