Remove reference to knotc start from documentation

doc/running.texi

@@ -47,13 +47,12 @@ Parameters:
  -v, --verbose              Verbose mode - additional runtime
                             information.
  -V, --version              Print knot server version.
- -w, --wait                 Wait for the server to finish start/stop
+ -w, --wait                 Wait for the server to finish stop
                             operations.
  -i, --interactive          Interactive mode (do not daemonize).
  -h, --help                 Print help and usage.
 
 Actions:
- start                      Start server (if not running).
  stop                       Stop server.
  restart                    Restart server.
  reload                     Reload configuration and changed zones.