docs: convert fenced pycon examples to doctests in boxes.py and draw/utils.py

[shaoming11]

Summary

• Converts all fenced ```pycon / ```python example blocks in src/supervision/detection/utils/boxes.py and src/supervision/draw/utils.py to bare >>> doctest format
• Examples are now automatically verified by the test suite via --doctest-modules
• No logic changes — purely docstring formatting

Addresses the project preference stated in CONTRIBUTING.md:

when an example uses only supervision, NumPy, and the standard library … prefer >>> doctest format so it is automatically verified by the test suite

Files changed

• src/supervision/detection/utils/boxes.py — 9 fenced blocks converted (clip_boxes, pad_boxes, denormalize_boxes, move_boxes, move_oriented_boxes, xyxyxyxy_to_xyxy, _oriented_box_anchors, scale_boxes, spread_out_boxes)
• src/supervision/draw/utils.py — 7 fenced blocks converted (draw_line, draw_rectangle, draw_filled_rectangle, draw_rounded_rectangle, draw_polygon, draw_filled_polygon, draw_image)

Test plan

• uv run pytest --doctest-modules src/supervision/detection/utils/boxes.py — 10 passed
• uv run pytest --doctest-modules src/supervision/draw/utils.py — all passed

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[Borda]

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@shaoming11 ^^ pls 🦝

[Copilot]

Pull request overview

This PR converts fenced code blocks in docstring examples to plain >>> doctest format for two core modules, so examples are automatically executed and validated by the existing --doctest-modules test configuration.

Changes:

• Replaced fenced python / pycon docstring blocks in draw/utils.py with runnable doctest prompts and simple assertions (e.g., result.shape).
• Removed fenced block markers in detection/utils/boxes.py so existing examples are parsed as doctests.
• Standardized docstring example headings (e.g., Example:) where blocks were converted.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/supervision/draw/utils.py	Converts drawing utility docstring examples to runnable doctests (using result = ... and lightweight checks).
src/supervision/detection/utils/boxes.py	Removes fenced markers so existing >>> examples become active doctests.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87%. Comparing base (d5cadf5) to head (6185339).

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #2425   +/-   ##
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  Coverage       87%     87%           
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  Files           71      71           
  Lines        10485   10485           
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  Hits          9098    9098           
  Misses        1387    1387           

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