JSON: Example Accidentals, boolean property values must not be quoted

[paul-bayleaf]

The MNX example Accidentals has quoted the boolean property value "true".
Lines 69, 125, 167.

Suggested fix: remove quotes from boolean values.

I have written a JSON schema for MNX, is this of interest? If so I can prepare a pull request.

[mscuthbert]

Yes! It! Is!

[adrianholovaty]

@paul-bayleaf Thanks for another good catch! Yes, please do open a pull request with a JSON Schema. My plan is to try to automatically generate such a schema from our documentation, but it would be very useful to get another person's perspective on it (and it would definitely come in handy in the interim). Much appreciated.