Fixing Formatting for Pipeines API docs

[123sarahj123]

After making some additions to the Pipelines API docs page, I noticed the coding examples provided in the properties tables for requests was not always consistent.

This PR aims to make the examples a consistent format for this particular docs page (as I am just passing by).

Before:

After:

[buildkite-docs-bot]

Preview URL: https://2917--bk-docs-preview.netlify.app