chore: rename reference-architecture to reference-architectures and update links

[piyush117]

Description

issue: https://github.ibm.com/GoldenEye/issues/issues/15855

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[piyush117]

/run pipeline

[terraform-ibm-modules-ops]

🎉 This PR is included in version 5.3.5 🎉

The release is available on:

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• v5.3.5

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