[Other] Fix the sample inline deletion vector #2050
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Which Delta project/connector is this regarding?
Description
Fixes the example inline deletion vector to match how the code currently works. The existing sample likely dates to an older specification and caused (me) quite a bit of confusion when I was implementing deletion vector support in our code.
Resolves #1905
How was this patch tested?
I ran the new sample through code which successfully decodes other DVs written by Spark and confirmed that the right values came back out.
Does this PR introduce any user-facing changes?
It only updates developer-facing documentation.