feat(docs): add edit link

[abitrolly]

Description

Link to edit source markdown file from documentation pages.

See https://vitepress.dev/reference/default-theme-edit-link

Motivation and Context

To add comments to the docs.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

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[abitrolly]

@escapedcat the windows failure does not seem related to this PR.

[escapedcat]

@escapedcat the windows failure does not seem related to this PR.

No worries. That one is flacky. Restarted it.