DOC: Add short list-value example

Summary

Adds a short example of list-valued properties to the documentation

Focus

Check the new tutorial section for understandability.

Test Environment

make doc and look at the resulting html.

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src/doc/tutorials/Data-Insertion.rst

@@ -147,7 +147,7 @@ With this example file
 List Properties
 ---------------
 
-As you may already know, properties may also have list instead of scalar
+As you may already know, properties can also have list values instead of scalar
 values. They can be accessed, set, and updated as you would expect from any
 list-valued attribute in Python, as the following example illustrates.