Table docs: Provide an example for Row Header

[silvalaura]

From Leslie:

(In the docs site) I see this great example of column headers. But I do not see an example of row headers, even though the props ARE provided: TableRow Props. Wondering if we could put an example in that location also?

Here is the example from the Assessment Overview that needs row headers. Notice that 1 of 3, 2 of 3, 3 of 3 are important for the student to know which scores they are looking at.