docs: fix failing anchors on kubernetes and docker docs

[ppawlowski]

Description

This pull request fixes failing hyperlink validation executed against the whole flowfuse website build.
A successful links validation test with changes from this PR: https://github.com/FlowFuse/website/actions/runs/11955879818/job/33329770167

Related Issue(s)

Checklist

• I have read the contribution guidelines
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
  • Upgrade instructions
  • Configuration details
  • Concepts
• Changes flowforge.yml?
  • Issue/PR raised on FlowFuse/helm to update ConfigMap Template
  • Issue/PR raised on FlowFuse/CloudProject to update values for Staging/Production

Labels

• Includes a DB migration? -> add the area:migration label

[Yndira-E]

This test also lists bad anchors in website/src/docs/user/snapshots.md. Would you mind taking a look?

[hardillb]

Approved but not merged to allow for @Yndira-E's comment

[ppawlowski]

This test also lists bad anchors in website/src/docs/user/snapshots.md. Would you mind taking a look?

This PR supposed to fix it...