fix: link to sdk repo

[janb87]

Summary by Sourcery

Documentation:

• Correct the URL to the SDK GitHub repository.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request updates the link to the SDK repository in the documentation.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Updated the SDK repository link.	Changed the SDK GitHub repository link from https://github.com/settlemint/settlemint-sdk to https://github.com/settlemint/sdk.	docs/using-platform/15_dev-tools/1_SDK.md

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[sourcery-ai]

Hey @janb87 - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Review instructions: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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