docs(memo): document memo_key per-parameter override#2000
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Add a section to advanced_topics/memoization_keys.mdx covering the `memo_key=` decorator argument added in #1888 — per-call-site counterpart to the existing type-level customization mechanisms (`__coco_memo_key__`, `register_memo_key_function`). Covers callable vs `None` semantics, `self`/`*args`/`**kwargs` handling, and decoration-time validation. Add a pointer from the function programming guide's "Customizing data fingerprinting" subsection so users following the main guide find their way to the new section.
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Summary
memo_key=decorator argument added in Add per-argument memo_key support to @coco.fn #1888 as a new section inadvanced_topics/memoization_keys.mdx, alongside the existing type-level customization paths (__coco_memo_key__,register_memo_key_function).Nonesemantics,self/*args/**kwargshandling, decoration-time validation, and a "picking the right tool" tip.Test plan