Fixes #1402: clarify readOnly applies to any value, not just properties

[DavidBiesack]

clarify that readOnly applies to any value, not just properties.
Re-format true and false code values

Resolves #1402

[jdesrosiers]

Thanks for doing this and for taking the time to do the additional cleanup.

[jdesrosiers]

Suggested change

	e# JSON Schema Validation: A Vocabulary for Structural Validation of JSON
	# JSON Schema Validation: A Vocabulary for Structural Validation of JSON

[jdesrosiers]

When I read "an instance" my mind went to the "the entire JSON document", which isn't the intention. I think "instance" can be used to refer to a fragment of a JSON document, but we usually don't use it that way so this might be confusing.

What if we just leave it at "the value" and drop the "of" part entirely? Or we could say "that value within an instance"?

[gregsdennis]

or "the local instance"

[DavidBiesack]

how about :

If `readOnly` has a value of boolean `true`, it indicates that the
corresponding value in the instance is
managed exclusively by the owning authority, and attempts by an
application to modify the value are expected to be ignored or
rejected by that owning authority.

[DavidBiesack]

is his ready to merge? I'm not sure how to reset the "PR Policy / Require Minimum Open Time (pull_request)" check

[gregsdennis]

We can rerun it from our end, but you can also close then reopen the PR.

It'll fail if the PR hasn't been open for two weeks. It's a policy we've had in place for a long time.