CLI - known account - change an error message

Based on a comment below our post: https://hive.blog/hive-139531/@thebeedevs/clive-updates-known-account-feature-ready-in-the-cli-and-the-tui.

When you try to process a transaction but the recipient is not on your list of known accounts, the following error occurs:

Instead of:

See clive configure known-account -h, there should be:

You can do this using the command: `clive configure known-account add [account name]`.
For more information about the known-account feature, see `clive configure known-account -h`.

Note: [account name] in above message should be replaced with actual account name (guest4test1 in example case)