Minor updates to the Delta Lake rst

[dennyglee]

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[linux-foundation-easycla[bot]]

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• :white_check_mark: Denny Lee (0127d90460aea39ddd675ec934a6ed8da490eebe, 42d37307c3962b87d728ef1326dc78671e726ef3)

[stale[bot]]

This pull request has been automatically marked as stale because it has not had recent activity. If you'd still like this PR merged, please comment on the task, make sure you've addressed reviewer comments, and rebase on the latest master. Thank you for your contributions!

[steveburnett]

Closing due to lack of activity and age. If this is still relevant, please re-open this PR, rebase, and resolve any file conflicts.