Add information to the files explaining how the URI string was created.

Hello,

It is almost impossible to understand this tutorial without an explanation of how the core of all the example files—the uri string—was created.

The explanations about accessors and buffer views do not make sense if it is not clear which part of the data they are actually referencing.

Please add a script or description showing how the data string was created for each example.

Review the example files and the existing explanations of accessors and buffer views, then trace how each example's URI string relates to its referenced data. Add a script or description for every example showing how its data string was created, so readers can understand those references.

Written by the indexing model from the issue text.