Fix typo in option

Author: nickva

src/config/logging.rst

@@ -114,7 +114,7 @@ Logging options
  [log]
  syslog_host = localhost
 
- .. config:optoin:: syslog_port
+ .. config:option:: syslog_port
 
  Specifies the syslog port to connect to when sending logs. Only used by
  the ``syslog`` :option:`writer <log/writer>`.