docs: Convert ASCII diagrams to mermaid

[krikera]

Summary

Convert ASCII diagrams to Mermaid diagrams in API documentation to improve readability and maintainability. The changes affect two files:

• docs/content/concepts/apis/admission-webhooks.md
• docs/content/concepts/apis/exporting-apis.md

What Type of PR Is This?

/kind documentation
/kind cleanup

Related Issue(s)

Fixes #3432

Release Notes

NONE

[kcp-ci-bot]

Hi @krikera. Thanks for your PR.

I'm waiting for a kcp-dev member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[ntnn]

/ok-to-test

[embik]

/approve

Thank you for the contribution to kcp!

[kcp-ci-bot]

LGTM label has been added.

Git tree hash: 7a858348d3fc06f38f21146086cf5f11fc3b84d3

[kcp-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: embik

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