Add section on annotating large instances for model training

[Albane-dlv]

I added a section on annotating large instances for model training.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 6af9307d-273a-4aec-8167-903698a7e503

📥 Commits

Reviewing files that changed from the base of the PR and between d4a2f84 and 439e8e5.

⛔ Files ignored due to path filters (1)

• docs/tutorials/images/tutorial_trainingdata_08_soma_ground_truth_example.png is excluded by !**/*.png

📒 Files selected for processing (1)

• docs/tutorials/trainingdata_annotation.md

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📝 Walkthrough

Walkthrough

Documentation update to docs/tutorials/trainingdata_annotation.md adding guidance on instance segmentation, distinguishing it from dense neuron segmentation. Introduces labeling conventions, segment ID assignment, and handling large structures at reduced resolution magnifications with practical recommendations.

Changes

Cohort / File(s)	Summary
Training Data Annotation Documentation docs/tutorials/trainingdata_annotation.md	Added instance segmentation guidance distinguishing from dense segmentation, including labeling practices for structures of interest, segment ID assignment, and handling large instances (somata, nuclei, blood vessels) at reduced resolution with 3D verification reminders. Updated opening paragraph to note applicability to instance segmentation with additional considerations.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• Added annotation tutorial to docs #9240: Introduces the training data annotation tutorial in the same documentation file that this PR builds upon with instance-segmentation-specific guidance.

Suggested labels

documentation

Poem

🐰 A guide grows wise with careful thought,
Where instances are neatly caught,
At smaller scopes, we work with care,
Each segment marked, each structure fair,
The bunny cheers—annotation's art!

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately reflects the main change: a new section on annotating large instances for model training was added to the documentation.
Description check	✅ Passed	The description is directly related to the changeset, stating that a section on annotating large instances for model training was added.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs-edit-albane

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