Create command line examples for --help

[JoshuaBatty]

We should add some common examples of commands that users might want to run when they type --help on a forc binary. The idea is to act like a "clippy" and minimise the need for users to leave the command line to reach for the docs to proceed with common operations of our tools.

Let's start by adding between 1-3 examples for the following programs.

• forc tx
• forc doc
• forc index
• forc deploy
• forc crypto
• forc run

Note, some of these like forc doc might only need one or two examples, where forc tx could benefit for more examples depending on what --help was called on.

Currently only forc wallet has examples. Here is what they look like for reference.

EXAMPLES:
    # Create a new wallet at the default path `~/.fuel/wallets/.wallet`.
    forc wallet new

    # Import a new wallet from a mnemonic phrase.
    forc wallet import

    # Derive a new account for the default wallet.
    forc wallet account new

    # Derive a new account for the wallet at the given path.
    forc wallet --path /path/to/wallet account new

    # Derive (or re-derive) the account at index 5.
    forc wallet account 5 new

    # Sign a transaction ID with account at index 3.
    forc wallet account 3 sign tx-id 0x0bf34feb362608c4171c87115d4a6f63d1cdf4c49b963b464762329488f3ed4f

    # Sign an arbitrary string.
    forc wallet account 3 sign string "blah blah blah"

    # Sign the contents of a file.
    forc wallet account 3 sign file /path/to/data-to-sign

    # Sign a hex-encoded byte string.
    forc wallet account 3 sign hex "0xDEADBEEF"

    # You can also use the `sign` subcommand directly. The following gives the same result.
    forc wallet sign --account 3 string "blah blah blah"

    # Sign directly with a private key.
    forc wallet sign --private-key string "blah blah blah"

    # Temporarily display the private key of the account at index 0.
    forc wallet account 0 private-key

    # Show the public key of the account at index 0.
    forc wallet account 0 public-key

    # Transfer 1 token of the base asset id to a bech32 address at the gas price of 1.
    forc wallet account 0 transfer --to fuel1dq2vgftet24u4nkpzmtfus9k689ap5avkm8kdjna8j3d6765yfdsjt6586
    --amount 1 --asset-id 0x0000000000000000000000000000000000000000000000000000000000000000 --gas-price 1

    # Transfer 1 token of the base asset id to a hex address at the gas price of 1.
    forc wallet account 0 transfer --to 0x0b8d0f6a7f271919708530d11bdd9398205137e012424b611e9d97118c180bea
    --amount 1 --asset-id 0x0000000000000000000000000000000000000000000000000000000000000000 --gas-price 1

[crodas]

Fixed in #5388 and will continue in #5444 (and FuelLabs/forc-wallet#157)