docs: clarify canonical pruning documentation source (#1871)

[DIYA73]

Fixes #1871

The pruning documentation is split between docs/source/guides/3_pruning.rst
and examples/pruning/README.md, causing confusion about which is authoritative.

The examples/pruning/README.md is the comprehensive, up-to-date reference
covering Minitron, Puzzletron, FastNAS, support matrix, guidelines, and
distillation hyperparameters.

This PR adds a note to the RST guide making clear:

• The README is canonical for Minitron and Puzzletron (LLM/VLM pruning)
• The guide covers FastNAS for Computer Vision models

Signed-off-by: Diya diyaismahil7@gmail.com

Summary by CodeRabbit

• Documentation
  • Updated the pruning guide’s introductory content for clearer separation of general guidance and the related Minitron/Puzzletron note.
  • Clarified that the guide focuses on FastNAS pruning for computer vision models.
  • Added references to the Pruning README for Minitron and Puzzletron API examples, support information, guidelines, and distillation hyperparameters.

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📝 Walkthrough

Walkthrough

The pruning guide now ends its introductory sentence before a separate top-level note. The note continues to direct Minitron and Puzzletron users to the Pruning README and identifies FastNAS computer-vision pruning as the guide’s focus.

Changes

Pruning documentation

Layer / File(s)	Summary
Canonical pruning guidance docs/source/guides/3_pruning.rst	The introductory sentence now ends with a period. The Minitron and Puzzletron guidance appears in a separate top-level Sphinx note. The README reference and FastNAS scope remain unchanged.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Other · Severity of issue fixed: Low

Suggested reviewers: aanoosheh

Merge Risk: ⚪ Minimal · up to 57054

The documentation clarification is merge-ready.

🚥 Pre-merge checks | ✅ 6

✅ Passed checks (6 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: clarifying the canonical source for pruning documentation.
Linked Issues check	✅ Passed	Issue #1871 asks the documentation to identify the authoritative pruning source. The guide now states that the examples/pruning Pruning README is canonical for Minitron and Puzzletron pruning. The g…
Out of Scope Changes check	✅ Passed	The whole-PR diff changes only docs/source/guides/3_pruning.rst. The added note and its scope clarification directly address issue #1871. No unrelated code or documentation change is present.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Security Anti-Patterns	✅ Passed	PASS. The review-scoped diff changes only docs/source/guides/3_pruning.rst (+7 lines). It adds documentation text and introduces no Python, dependency, model-loading, dynamic-evaluation, or `# nosec…

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👉 Steps to fix this

Actionable comments posted: 1

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Inline comments:
In `@docs/source/guides/3_pruning.rst`:
- Line 9: Update the introductory example sentence before the pruning guidance
to end with a period, then place the top-level Sphinx .. note:: directive on its
own line so the guidance renders as a separate note rather than remaining inside
the existing tip.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.62%. Comparing base (b163567) to head (57054dc).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2469      +/-   ##
==========================================
- Coverage   71.49%   70.62%   -0.87%     
==========================================
  Files         590      600      +10     
  Lines       64759    66436    +1677     
==========================================
+ Hits        46297    46918     +621     
- Misses      18462    19518    +1056     

Flag	Coverage Δ
unit	58.19% <ø> (+0.34%)	⬆️

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[kevalmorabia97]

Doc building fails: https://github.com/NVIDIA/Model-Optimizer/actions/runs/35306454307/job/105717598608?pr=2469#step:4:512

[kevalmorabia97]

/ok to test 57054dc