Visual presentation: Improve wording of techniques instructions

[kfranqueiro]

This attempts to smooth over some awkward wording in the techniques instructions for Visual Presentation, which Mike flagged in #4509 (comment).

Mike's original suggestion:

1.4.8: This is a little unusual. I agree with taking out the "OR" but I wonder if we should tweak the Instructions to read:

...you must satisfy each of the numbered requirements, using one or more of the listed techniques."

My counter-argument/proposal:

You are changing "one" to "one or more" in the process, which contradicts the original text (and the "OR"s we are removing). You're also shifting "numbered" from referring to the items (which I have to assume alluded to the technique IDs, unless this was actually an ol at some point in the past) to the requirements (which are sort of numbered, but using spelled-out ordinals rather than actual numerals, so this might seem slightly awkward).

How about: "you must satisfy each requirement using one of its listed techniques"?

For context of the "OR"s in question, see an archived version of Visual Presentation from September.

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