Instrument accessibility note

[Jym77]

Add a note in the definition of instrument, and the rules using it, to indicate that instruments should be accessible.

Closes issue(s):

• closes Should "instrument"/"mechanism" be accessible? keyboard actionable? #1524

Need for Final Call:
This will not require a Final Call (editorial changes)

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[WilcoFiers]

Wrong button.

[carlosapaduarte]

Typo

Change accepted.

Change done