docs: correct pip extras in installation guide to match setup.cfg

[ymxlx]

Description

The extras list in the installation guide (docs/source/installation.md) has drifted from the actual [options.extras_require] section of setup.cfg:

1. onnxruntime is documented as an extra, but no such extra exists. onnxruntime is a dependency installed by the onnx extra. As a result, pip install 'monai[onnxruntime]' currently succeeds but silently installs nothing (pip only warns that the extra is unknown), which is misleading for users following the docs.
2. Four real, functional extras are undocumented: torchio, packaging, polygraphy, and pyamg.
3. The "which correspond to" package list was misaligned with the bracket list (40 vs 39 entries, out of step from transformers onward).

This PR updates only the documentation so the bracket list and the corresponding package list match setup.cfg exactly (42 extras, one prose entry per extra, same order), and notes that the onnx extra also installs onnxruntime. Verified programmatically: 0 missing, 0 extra, 0 nonexistent after the edit. No changes to setup.cfg.

Types of changes

• Non-breaking change (documentation only)

DCO: commit is signed off (Signed-off-by: ymxlx).

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• docs/source/installation.md

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📝 Walkthrough

Walkthrough

Updated the installation documentation’s all-optional-dependencies list. The documented extras now include torchio, omit the explicit onnxruntime entry, and state that onnx installs onnxruntime. The dependency mapping prose was also revised for openslide-python and the hyena/nvsubquadratic relationship.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the documentation-only extras alignment change.
Description check	✅ Passed	The description follows the template with a clear summary and change-type section, and is mostly complete.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
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Inline comments:
In `@docs/source/installation.md`:
- Line 293: Update the dependency list in the installation documentation to
state that the `onnx` extra installs `onnxruntime` only for Python 3.10 and
earlier; clarify that Python 3.11 and newer users should not expect
`onnxruntime` to be installed automatically.

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Reviewing files that changed from the base of the PR and between 3a458fe and 1a62872.

📒 Files selected for processing (1)

• docs/source/installation.md