Update authenticating-siws.md

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Description

Please include a summary of the changes and the related issue. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes # (issue)

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• Introducing new feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Link to the relevant updated sections in the Netlify preview

• Link 1: [description of change]
• Link 2: [...]

Checklist:

General

• I have performed a self-review of my code
• I have fixed all grammar issues (can use an AI tool to check), and explanations are in active voice
• I have checked the additions are concise
• Language is consistent with existing documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published (ie. SDK changes, node dependencies)

If I have added a new concept, I have

• included a beginner friendly explanation
• included a basic technical introduction and code sample
• new terms are defined, both in relevant new pages and in the glossary

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