Help message for list command partially shows erroneous text

[zwliew]

When executing the command list a (in order to trigger the invalid command format message), the resulting help message states:

Invalid command format! 
%1$sPlease use: 
list: Lists students with optional sorting and filtering.
Parameters:
  [Optional] f/FILTER_TYPE fv/FILTER_VALUE
  [Optional] s/SORT_TYPE o/SORT_ORDER
Supported SORT_TYPE: name, progress, github
Supported SORT_ORDER: asc (ascending), des (descending)
Supported FILTER_TYPE: class, team, progress
Example: 
1. list s/name o/asc
2. list f/class fv/T01
3. list f/class fv/T01 s/name o/asc

Notice the erroneous %1$sPlease use text.