gnunet-core: unrecognized option `--show-identity'

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In the manual, https://docs.gnunet.org/latest/users/start.html
there is a command like

```
gnunet-core --show-identity
/usr/local/bin/gnunet-core: unrecognized option `--show-identity'
Use --help to get a list of options.
~/gnunet [1] $ gnunet-core --help
gnunet-core
Print information about connected peers.
Arguments mandatory for long options are also mandatory for short
options.
  -c, --config=3DFILENAME      use configuration file FILENAME
  -h, --help                 print this help
  -L, --log=3DLOGLEVEL         configure logging to use LOGLEVEL
  -l, --logfile=3DFILENAME     configure logging to write logs to
FILENAME
  -m, --monitor              provide information about all current
connections
                               (continuously)
  -s, --connection-status    Show current connections
  -v, --version              print the version number

Report bugs to [email protected].
Home page: http://www.gnu.org/s/gnunet/
General help using GNU software: http://www.gnu.org/gethelp/
```

Maybe we should update the page.

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