IDE-305 Missing parameter in documentation for Std.Str.SplitWords()

Signed-off-by: RichardTaylorHPCC <richard.taylor@lexisnexis.com>
Merge pull request #4761 from RichardTaylorHPCC/BIDE305

IDE-305 Missing parameter in documentation for Std.Str.SplitWords() 

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>