[w3c/permissions] `MidiPermissionDescriptor` in example 1 is confusing (#197)

`MidiPermissionDescriptor` in example 1 is confusing in that it says [emphasis added]:
> The "midi" feature has _two aspects_...

..yet the example JS has a boolean for ostensibly only one of those aspects:
```JS
dictionary MidiPermissionDescriptor : PermissionDescriptor {
  boolean sysex = false;
};
```
...?

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https://github.com/w3c/permissions/issues/197