[PE Dry Run]F11-4 Edit stored location not working as advertised

[nus-se-bot]

Firstly, the help screen provides ambiguous information regarding the command. I am not sure if this argument must be input with sl/ or fl/.

edit 7 sl/C:\PE Dry Run\random is said to be invalid

edit 7 fl/C:\PE Dry Run\random gives the message that "timetable can only be in csv", however the help page does not mention this anywhere, and example given does not include a .csv extension

edit 7 fl/C:\PE Dry Run\random.csv gives the message that "This is not a valid file path"

I repeated this again, after manually creating a .csv file at that location, and the command was finally accepted.

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Reported by: @vig42
Severity: Not Specified

_{[original: nus-cs2103-AY1819S1/pe-dry-run#705]}