Update doc/administration/operations/puma.md
What does this MR do and why?
Describe in detail what your merge request does and why.
This just clarifies where the configuration file is that the settings are referring to.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.