improving text for transactional write

[NavinShrinivas]

Pertains to issue #901. Doesn't have the GIF/video example attached. The text added in this PR is picked from the API documentation and I felt its relevant here as well.

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @NavinShrinivas. Thanks for your PR.

I'm waiting for a etcd-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[ivanvc]

Hi @NavinShrinivas, I just read about this PR in the #sig-etcd channel. Let's run the linter as a first pass, then I'll deliver a review 😄

/ok-to-test

[NavinShrinivas]

/retest

[NavinShrinivas]

/retest

[NavinShrinivas]

@ivanvc

[ivanvc]

@NavinShrinivas, sorry for the late response. Please refer to #901 (comment)