Substring improvement

[CathyC]

Found when writing documentation
Substring requires you put the length. It should be optional. if you omit it, it should go to the end of the string

I talked to Jeff about this, if you omit the start index, it starts at 0 (this is expected)
If you omit the length though, it assumes zero. it should assume the end of the string.

So it does actually allow blank despite showing as required

[SteveCap]

Task #11037 has been created. This post will be updated when it has been completed.