Improve documentation on dbLocation
and related error message on node
#541
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As a parameter,
dbLocation
controls the directory we use to store the database file. When used, it should always point at an existing directory because we're not creating it beforehand. This is not mentioned in the JSDoc, so this adds a sentence about that.For the node SDK, this also improves the error message when misusing
dbLocation
by including the solution (creating the directory).