Add more detail about locations in Chapter 2 of tutorial.
Add more detail about locations in Chapter 2 of tutorial.

Resolves issue 241 (https://github.com/tensorflow/mlir/issues/241).

PiperOrigin-RevId: 281867192
Change-Id: I59dea8430eeb95f11b8a00c0a5dd46405e8e05e6

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