Add reference documentation use cases guide

[mintlify]

Created a new guide explaining when and how to use reference documentation effectively. Added the page to the Best practices section in the Guides navigation.

Files changed:

• guides/reference-use-cases.mdx - New page covering reference documentation use cases, characteristics, and best practices
• docs.json - Added new page to Guides > Best practices navigation

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Note

Low Risk
Content-only documentation addition plus a navigation entry; no runtime logic or data/security behavior changes.

Overview
Adds a new guide page, guides/reference-use-cases.mdx, describing when to use reference documentation, what it is/isn’t, common use cases, and best practices.

Updates docs.json to include the new page under Guides → Best practices so it appears in navigation.

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