typo: add vLLM Prefix Cache & LoRA Adapters links

[zhengkezhou1]

In https://gateway-api-inference-extension.sigs.k8s.io/#concepts-and-definitions, the Prefix Cache and LoRA Adapters missed web links.

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[k8s-ci-robot]

Hi @zhengkezhou1. Thanks for your PR.

I'm waiting for a kubernetes-sigs 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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[kfswain]

/ok-to-test

[danehans]

I verified the links worked in the Netlify preview deployment.

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: danehans, zhengkezhou1

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[nirrozenbaum]

good catch @zhengkezhou1 :)