handle_cli_error decorator overwrites command help docstring

[Aircoookie]

Minor issue.

How to reproduce: trustpoint_client list

Output:

...
Commands:
  credential         Lists all available keys.
  domain-credential  Handles any unexpected errors and re-raises all...
  trust-stores       Lists all available trust-stores.

Expected:

...
Commands:
  credential         Lists all available keys.
  domain-credential  Lists the domain credential.
  trust-stores       Lists all available trust-stores.