dhi: fix external links (#23862)

<!--Delete sections as needed -->

## Description

Fix external links

## Related issues or tickets

<!-- Related issues, pull requests, or Jira tickets -->

## Reviews

<!-- Notes for reviewers here -->
<!-- List applicable reviews (optionally @tag reviewers) -->

- [ ] Editorial review

Signed-off-by: Craig Osterhout <craig.osterhout@docker.com>

Author: craig-osterhout

content/manuals/dhi/core-concepts/slsa.md

@@ -14,7 +14,7 @@ Developed by Google and maintained by the Open Source Security Foundation
 tampering, improve integrity, and secure packages and infrastructure in software
 projects.
 
-SLSA defines [four build levels (0–3)](https://slsa.dev/spec/latest/levels) of
+SLSA defines [four build levels (0–3)](https://slsa.dev/spec/latest/build-track-basics) of
 increasing security rigor, focusing on areas such as build provenance, source
 integrity, and build environment security. Each level builds upon the previous
 one, offering a structured approach to achieving higher levels of software
@@ -59,7 +59,7 @@ reduces the risk of supply chain attacks.
 Docker Hardened Images (DHIs) are secure-by-default container images
 purpose-built for modern production environments. Each DHI is cryptographically
 signed and complies with the [SLSA Build Level 3
-standard](https://slsa.dev/spec/latest/levels#build-l3-hardened-builds), ensuring
+standard](https://slsa.dev/spec/latest/build-track-basics#build-l3), ensuring
 verifiable build provenance and integrity.
 
 By integrating SLSA-compliant DHIs into your development and deployment processes, you can:

content/manuals/dhi/explore/feedback.md

@@ -12,8 +12,9 @@ in improving the Hardened Images ecosystem.
 
 ## Questions or discussions
 
-You can use the [GitHub Discussions board](https://github.com/docker-hardened-images/discussion) to engage with the DHI
-team for:
+You can use the [GitHub Discussions
+board](https://github.com/orgs/docker-hardened-images/discussions) to engage
+with the DHI team for:
 
 - General questions about DHIs
 - Best practices and recommendations
@@ -23,7 +24,7 @@ team for:
 
 ## Reporting bugs or issues
 
-You can [open a new issue](https://github.com/docker-hardened-images/discussion/issues/) for topics such as:
+You can [open a new issue](https://github.com/docker-hardened-images/catalog/issues) for topics such as:
 
 - Bug reports
 - Feature requests