docs: Added DA links

[arya-girish-k]

Description

Added links of two DA's (VSI on VPC landing zone and Red Hat OpenShift Container Platform on VPC landing zone) in vpc landing zone description.
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Release notes content

Added links of two DA's (VSI on VPC landing zone and Red Hat OpenShift Container Platform on VPC landing zone) in vpc landing zone description.

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[arya-girish-k]

/run pipeline

[arya-girish-k]

/run pipeline

[Aashiq-J]

/run pipeline

[terraform-ibm-modules-ops]

🎉 This PR is included in version 6.6.3 🎉

The release is available on:

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• v6.6.3

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