Add info about faucet's required pool id format - bech32

[ArturWieczorek]

When using faucet to delegate funds to pool and entering pool ID in hex format - 3ad683d9d9f38f43c1b638f0e79f1c91173d324c0c3055971aacf575 there is an error.

Request Method: GET
Status Code:400

Request URL:
https://faucet.preview.world.dev.cardano.org/delegate?poolid=3ad683d9d9f38f43c1b638f0e79f1c91173d324c0c3055971aacf575&api_key=&g-recaptcha-response=03AL8dmw-05XFCq0ZZlmR9qg_mIVsjEXrNlxC3VmSAgy8BgEPKXOzrC6tQLaRclR8qPlzfuDXveWykFGJwMG36ogKt0dvmYoYOgClUzsmLR-XU-W6KHDBvXywLgEzZDjkMYCKBADt7_Ddg-VjdKvgliZA26Hs-XhQZ75Y3S29NAY51dhNV6hxZPcTh0r-JxfwxAyNa--1cU31vhrZAdAxhVi9xMCyASbr3lC82XYQRYkDezI1-HRxWqJmHFDE34lzCI6hDpiP7NK0bbi8Yebo5YQDDyfSTA_LFYY1QHYyrGJIh-CUDGEj8JdeVJpnYQMoejWQhUm5Cq7zQkOMBuR1in_APnc7uaySXXyV7F8P5IIYfqYX-eQECE7aRa-HpOWa-wOErKlmMQwGSGrXnXV-kAQi512XZ3qom76ZexMk17ud42c0ofeX5l2XBEOYdjSNFEjYF-KNSuSoaiU4fDPcZdLDmW3jUGD6x0ylLj9HnOQg9NQFR-3eMSjinN6wLyLhWnCoJnB-TRsohe5LkoJin_lMJvMD9QEsbBF9NkAXv-U1KxIr69wAAUmQ

This error however is not present when using bech32 format for pool ID - e.g. pool18ttg8kwe7w858sdk8rcw08cujytn6vjvpsc9t9c64n6h27wza2u.

I ran into this issue when trying to delegate funds to my test pool.
This PR updates documentation and aims to avoid confusion.

There is an enhancement ticket that is supposed to fix it and support two formats in the future: IntersectMBO/cardano-world#95

Original slack thread here: https://input-output-rnd.slack.com/archives/C03NYMJBD7F/p1687265266352119

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🔨 Latest commit	11db625

[CarlosLopezDeLara]

LGTM!

[NeilBurgess42]

@CarlosLopezDeLara has approved, that is good enough for me.