Clean up CLI tutorial (facebookresearch#283)

Summary:
- Fixes facebookresearch#282

Pull Request resolved: facebookresearch#283

Differential Revision: D90957223

Pulled By: talgalili

fbshipit-source-id: 9bbd76dc7ff4f10a4d5ce4b88a51dc620dadc23e

Author: neuralsorcerer

CHANGELOG.md

@@ -58,6 +58,8 @@
 - **Clearer validation errors in adjustment helpers**
   - `trim_weights()` now accepts list/tuple inputs and reports invalid types explicitly.
   - `apply_transformations()` raises clearer errors for invalid inputs and empty transformations.
+- **Cleaned up Balance CLI tutorial flow**
+  - Removed the unused synthetic dataset section, aligned diagnostics exploration by metric/variable pairs, and shortened the CLI help snippet.
 
 ## Code Quality & Refactoring