Changed last bullet point in 5.F.1 to reflect best practice

[danisaba]

…o members has to be present

Check one:

• [x] Semantic Change: something about the meaning of the text is different
• [ ] Non-semantic Change: Spelling, grammar, or formatting changes.

Summary of change(s):

changed one line so that only one of the two members of the dual has to be present. Made this section reflect current practice.