KG-156 update description of singleRunStrategy

[mltheuser]

Related to: KG-156

Motivation and Context

Updated KDoc for singleRunStrategy to correctly reflect that the default mode is ToolCalls.SEQUENTIAL and swapped outdated SingleRunMode references for the ToolCalls enum.

Breaking Changes

None.

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Type of the changes

• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Tests improvement
• Refactoring
• CI/CD changes
• Dependencies update

Checklist

• The pull request has a description of the proposed change
• I read the Contributing Guidelines before opening the pull request
• The pull request uses develop as the base branch
• Tests for the changes have been added
• All new and existing tests passed

Additional steps for pull requests adding a new feature

• An issue describing the proposed change exists
• The pull request includes a link to the issue
• The change was discussed and approved in the issue
• Docs have been added / updated