Update docs/reference/target-declaration.mdx

Author: lhstrh

docs/reference/target-declaration.mdx

@@ -690,7 +690,7 @@ In the TypeScript target, the generated JavaScript program understands the follo
 - `-h, --help`: Print this usage guide. The program will not execute if this flag is present.
 - `-k, --keepalive [true | false]`: Specifies whether to stop execution if there are no events to process. This defaults to `false`, meaning that the program will stop executing when there are no more events on the event queue. If you set this to `true`, then the program will keep executing until either the `timeout` logical time is reached or the program is externally killed. If you have `physical action`s, it usually makes sense to set this to `true`.
 - `-l, --logging [ERROR | WARN | INFO | LOG | DEBUG]`: The level of logging messages from the reactor-ts runtime to to print to the console. Messages tagged with a given type (error, warn, etc.) will print if this argument is greater than or equal to the level of the message (`ERROR` < `WARN` < `INFO` < `LOG` < `DEBUG`).
-- `-o, --timeout <duration> <units>`: Stop execution when logical time has advanced by the specified _duration_. The units can be any of nsec, usec, msec, sec, minute, hour, day, week, or the plurals of those.
+- `-o, --timeout <duration> <units>`: Stop execution when logical time has advanced by the specified _duration_. The units can be any of nsec, usec, msec, sec, minute, hour, day, week, or the plurals of those. For the duration and units of a timeout argument to be parsed correctly as a single value, these should be specified in quotes with no leading or trailing space (e.g. '5 sec').
 - `--single-threaded`: Specify to execute in a single thread.
 - `-w, --workers <n>`: Execute using `<n>` worker threads if possible. This option is incompatible with the `single-threaded` option.
 If provided, a command line argument will override whatever value the corresponding target property had specified in the source .lf file.