fix: inconsistent Milvus hostname default values in README

[pratik-naik003]

Fixes #227

There is a discrepancy in the default hostname provided for Milvus in the README.md file. In the Environment Variables table, it is my-release-milvus.docs-agent.svc.cluster.local, while in the Pipeline Parameters table it is milvus-standalone-final.docs-agent.svc.cluster.local. This PR unifies the default hostname across both tables to match the provided Helm installation instructions, preventing confusion for new users configuring the pipeline.

[x] My commits are signed off (git commit -s)

Testing

• Unit tests
• Integration tests
• E2E tests
• Manually tested (describe below)

Manually verified that the default values in both configuration tables now match my-release-milvus.docs-agent.svc.cluster.local.

[google-oss-prow]

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