Update documentation regarding sms sending time procedures

[eskebab]

Description

https://docs.altinn.studio/nb/notifications/what-do-you-get/

Send Window
SMS notifications are sent daily between 9 AM and 5 PM (Norway time).
Notifications scheduled outside this timeframe are sent at 9 AM the following day.
Notification orders can be placed at any time.

This information is outdated and should not mislead the user into thinking that Notifications is limited to sending SMS between 9 - 5pm. Update the documentation with information about sending time policy: anytime.

Additional Information

No response

[NathalieFroissart]

small pr in altinn studio docs Altinn/altinn-studio-docs#2555