shell: Add a space after colon

Just a cosmetic change, but IMHO the help looks much better now :).

Signed-off-by: Chaitanya Tata <Chaitanya.Tata@nordicsemi.no>
This commit is contained in:
Chaitanya Tata 2023-12-22 14:20:22 +05:30 committed by Anas Nashif
commit 66f63455ea