Minor typo in the help sections - 'previous' vs 'previous-year'

[TheAnalogyGuy]

stup/stup

Line 1671 in 955e24c

printf "\n%15s %s" "previous" "Alias to list the notes of previous-year"

Should be: printf "\n%15s %s" "previous-year" "Alias to list the notes of previous-year"

stup/stup

Line 1711 in 955e24c

printf "\n%15s %s" "previous" "Alias to search the notes of previous-year"

Should be printf "\n%15s %s" "previous-year" "Alias to search the notes of previous-year"

Example when running command based on current help:
Incorrect:

$ stup search 'foo' previous
Error: Unknown command "previous"

Correct:

$ stup search 'foo' previous-year
Searching for term 'foo' in all categories.
Searching notes from Friday January 01, 2021 to Friday December 31, 2021
Nothing found.