Update jammin purpose

[tomusdrw]

No description provided.

[coderabbitai]

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📝 Walkthrough

Walkthrough

The introduction description in the README documentation was updated to replace "Typeberry builders" with "JAM service builders." This is a documentation-only change with no modifications to code functionality or structure.

Changes

Cohort / File(s)	Summary
Documentation Updates docs/src/README.md	Updated introduction text: replaced "Typeberry builders" reference with "JAM service builders"

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~1 minute

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[Copilot]

Pull request overview

This PR updates the documentation to clarify that jammin is a toolbox for "JAM service builders" rather than "Typeberry builders". This change reflects the broader scope of the project, as it supports multiple JAM implementations beyond just Typeberry.

Key Changes:

• Updated the description of jammin's target audience from "Typeberry builders" to "JAM service builders"

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