Improve descriptions for timeout options

[rsenden]

The default description for --connect-timeout and --socket-timeout options is suitable for session login commands, but not for other commands like fcli ssc artifact import-debricked. The default descriptions state that these options configure session timeouts, but on non-login commands, these timeouts are only applied to the current command invocation.

We should update the descriptions, or potentially remove those options. In the example above, we could consider to use the timeouts configured on the fcli ssc session login command, instead of having these options on the fcli ssc artifact import-debricked command.