Docs: Invite Users Image Updation in Admin Guide

[RounakDhillon]

Describe your changes:

Fixes

I worked on Invite Users Image Updation in Admin Guide.

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Type of change:

• [ ] Bug fix
• [ ] Improvement
• [ ] New feature
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] Documentation

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Checklist:

• [x] I have read the CONTRIBUTING document.
• [ ] My PR title is Fixes <issue-number>: <short explanation>
• [ ] I have commented on my code, particularly in hard-to-understand areas.
• [ ] For JSON Schema changes: I updated the migration scripts or explained why it is not needed.

[github-actions[bot]]

Hi there 👋 Thanks for your contribution!

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