docs: added quick verification command for GPU Operator pods

[AnjaliMishra1st]

Summary

Added a verification step in the README to help users confirm that all GPU Operator pods are running successfully after deployment.

Why

This helps new users ensure their installation was successful and improves documentation clarity.

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[AnjaliMishra1st]

Hi @ArangoGutierrez, @cdesiniotis, @elezar, @shivamerla, @tariq1890 👋

Thank you for reviewing my PR.
This contribution adds a quick verification step in the README to help new users confirm that all GPU Operator pods are running successfully after deployment.

I tried to make it beginner-friendly and clear without changing any core functionality. Any feedback or suggestions to improve it further would be greatly appreciated.

Thank you for your time and guidance! 🙏

[AnjaliMishra1st]

Hi @ArangoGutierrez @cdesiniotis @elezar @shivamerla @tariq1890 👋

Just a kind follow-up on this PR (#1735).
It adds a small docs improvement — a quick verification command to help users confirm that GPU Operator pods are running successfully after deployment.

The checks are currently pending validation from NVIDIA runners.
Could one of you please validate or trigger the workflows (e.g., /ok-to-test) when you get a chance?

Appreciate your time and review support 🙏