Fix: tutorial1 - Bob's cred_ex_id is a string, should be variable

[SargisPlusPlus]

Description

Fixes typo: Tutorial 1, Part 2: cred_ex_id is mistakenly wrapped in quotes, it should be a variable

Affected Dependencies

N/A

How has this been tested?

• Manually, going through tutorial

Checklist

• [ ] I have followed the Contribution Guidelines and Code of Conduct
• [ ] I have commented my code following the OpenMined Styleguide
• [ ] I have labeled this PR with the relevant Type labels
• [ ] My changes are covered by tests

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