docs(backend): small formatting improvements

[dandawg]

Description of your changes:

This adds a couple of small formatting changes as a follow-up to PR #11511. The changes were suggested by @HumairAK (thanks Humair!).

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[google-oss-prow]

Hi @dandawg. Thanks for your PR.

I'm waiting for a kubeflow 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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[mprahl]

/lgtm

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hbelmiro, mprahl

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[hbelmiro]

/ok-to-test

[hbelmiro]

@HumairAK can you please bypass (or re-run) the CI?
This PR doesn't change any code. Hopefully, it was just a hiccup when running KFP Tekton backend unit tests.
We can keep an eye on the master branch to see if the test is broken for some reason.