Add usage note to schema:value, schema:minValue, schema:maxValue

[siuc-nate]

Per @stuartasutton the following usage note should be added to all three properties:

"For single values, use schema:value. For ranges, use schema:minValue and schema:maxValue".

Add:

URI: schema:minValue
Usage Note: "For single values, use schema:value. For ranges, use schema:minValue and schema:maxValue."

URI: schema:maxValue
Usage Note: "For single values, use schema:value. For ranges, use schema:minValue and schema:maxValue."

URI: schema:value
Usage Note: "For single values, use schema:value. For ranges, use schema:minValue and schema:maxValue."

[siuc-nate]

This has been done in pending CTDL and noted in the history tracking.