docs: align TEI verification instructions with model-specific Services

While reviewing the TEI deployment documentation in the sample-genai-on-eks-starter-kit repository, I noticed a mismatch between the verification instructions in docs/components/embedding-model/tei.md and the current model-specific Kubernetes manifests under components/embedding-model/tei/.
The documentation uses svc/tei with 8080:8080 for port forwarding, while the current model manifests create separate Services for each model, using model-specific Service names and port 80.
As a result, users following the documentation may see the verification command fail as written or may be unsure which Service and port should be used.

Relevant files:S
- docs/components/embedding-model/tei.md
- components/embedding-model/tei/model-*.template.yaml

Start with docs/components/embedding-model/tei.md and compare its verification steps with the model-specific Services in components/embedding-model/tei/model-*.template.yaml. Update the documented Service name and port to match the selected model manifest, then verify that the port-forward and verification command use the same values.

Written by the indexing model from the issue text.