Updating trading instructions for XMR (Monero)

[rating89us]

Prove payments:

• clarifying that the official wallets (Monero GUI or CLI) are NOT required to send XMR, since user can use some alternative wallets (desktop: MyMonero, Exodus / mobile: Cake Wallet, MyMonero, Monerujo) that provide the information required to prove a payment (transaction key, transaction ID and destination address). This information is not provided by the remaining desktop and mobile wallets that currently support Monero, but since they could provide it in the future, I kept the warning about using other wallets different from the previously mentioned.
• listing Monero GUI as first option (for most users), and CLI as second option (for advanced users)
• renaming "transaction hash" to "transaction ID", which is used in official wallets
• renaming "tx private key" to "transaction key", which is used in official wallets
• adding "Secret key" as synonymous for "transaction key" (used in MyMonero wallet)
• adding "destination address" and keeping "recipient's address" as synonymous
• renaming History tab to Transactions tab in Monero GUI
• adding "save recipient address" option must be enabled in Cake Wallet settings

Check payments:

• adding Monero GUI must be in Advanced mode
• adding Monero GUI verification must be done in Check Transaction section of Prove/check page
• adding parameters TXID TXKEY ADDRESS to the command check_tx_key in Monero CLI, as instructions in (https://www.getmonero.org/resources/user-guides/prove-payment.html)
• adding Explore Monero website (https://www.exploremonero.com/receipt) as alternative to verify payments
• removing payment ID instructions (it is being deprecated at the end of November in v0.15)

More info:

• directing to subreddit Monero support (https://www.reddit.com/r/monerosupport/), which is actively maintained, instead of Monero forum (https://forum.getmonero.org).