Update 4_12.adoc

[erincbailey]

@tungmhoang Not sure if this is the right way to do a change like this - but we did not note the limitation for scriptless:enable on TM. So added this line. Can you review (make sure I did it right) and approve?

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• [ ] Adds new file(s)
• [ ] Edits existing file(s)
• [ ] Removes file(s)

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