Add missing CLI options documentation (#255)

Author: stinovlas

docs/guide/cli.md

@@ -87,13 +87,15 @@ when you modify ignored files. To disable this functionality pass `--do-not-use-
 ### Other parameters
 
 * `--no-configure-logging` - disables default logging configuration for workers.
+- `--log-level` is used to set a log level (default `INFO`).
 * `--max-async-tasks` - maximum number of simultaneously running async tasks.
 * `--max-prefetch` - number of tasks to be prefetched before execution. (Useful for systems with high message rates, but brokers should support acknowledgements).
 * `--max-threadpool-threads` - number of threads for sync function exection.
 * `--no-propagate-errors` - if this parameter is enabled, exceptions won't be thrown in generator dependencies.
 * `--receiver` - python path to custom receiver class.
 * `--receiver_arg` - custom args for receiver.
 * `--ack-type` - Type of acknowledgement. This parameter is used to set when to acknowledge the task. Possible values are `when_received`, `when_executed`, `when_saved`. Default is `when_saved`.
+- `--shutdown-timeout` - maximum amount of time for graceful broker's shutdown in seconds.
 
 ## Scheduler
 
@@ -118,4 +120,6 @@ Path to scheduler is the only required argument.
 - `--tasks-pattern` or `-tp`.
   It's a name of files to import. By default is searches for all `tasks.py` files.
 - `--fs-discover` or `-fsd`. This option enables search of task files in current directory recursively, using the given pattern.
-- `--log-level` is used to set a log level.
+- `--no-configure-logging` - use this parameter if your application configures custom logging.
+- `--log-level` is used to set a log level (default `INFO`).
+- `--skip-first-run` - skip first run of scheduler. This option skips running tasks immediately after scheduler start.