Revise physicsnemo.mesh description in migration guide

[ram-cherukuri]

Updated the description of the physicsnemo.mesh library to emphasize its utilities for training dataset analysis and clarified its capabilities.

PhysicsNeMo Pull Request

Description

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.
• The CHANGELOG.md is up to date with these changes.
• An issue is linked to this pull request.
• If I am implementing a new model or modifying any existing model, I have followed the Models Implementation Coding Standards.

Dependencies

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[greptile-apps]

Greptile Overview

Greptile Summary

This PR updates the v2.0 migration guide’s description of physicsnemo.mesh to better reflect its role in training dataset analysis utilities and to clarify its capabilities. The change is confined to documentation (no code or API behavior changes), so it primarily affects how users understand and adopt the physicsnemo.mesh package during migration.

Important Files Changed

Filename	Overview
v2.0-MIGRATION-GUIDE.md	Updates physicsnemo.mesh description in two places; introduces an overly long line and a wording change that likely misrepresents scope ("pre-processing") vs earlier "training dataset analysis".

[greptile-apps]

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