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For #26135
This PR adds a small section to the Yaml reference guide for GitOps explaining that environment variables are permitted, but multiline variables can be challenging. We reference environment variables elsewhere in the doc but IMO it's good to put this in the general doc section rather than just underneath docs for specific keys.
cc: @allenhouchins, as there was no specific bug to fix for #26135 but I think having this documented might have prevented the issues there.