chore: Improve Sec template MR pipeline docs
What does this MR do and why?
As a follow-up to !100760 (merged), this adds two additional clarifications to our docs on running Sec templates for MR pipelines:
- All categories are supported
- Mixing
latestandstablecould lead to duplicate pipelines
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.