Update API docs for /api/deposits and /api/conversions for new filters + pagination

[Someguy123]

File in question:

https://github.com/Privex/cryptotoken-converter/blob/master/docs/source/rest_api.rst

[aisha-w]

hey, i'm interested in helping, what kind of updates do you need?

[Someguy123]

@aisha-w any help at all is appreciated :)

The easiest issue to deal with right now, is that the API docs are a little outdated, some APIs might be missing, and the output of some APIs such as the deposit/conversion APIs now have pagination - so they return differently to how the docs show.

Feel free to DM me on Discord, and join the SteemEngine Discord where this is primarily used: https://discord.gg/puPrvv (you'll see me in there as Someguy)