Perf script fix

[guyueh1]

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What does this PR do ?

This PR fixes typo in scripts/performance/llm/README and add two new benchmarks to the gb200 recommended configs.

Collection: [Note which collection this PR will affect]

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Additional Information

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[malay-nagda]

LGTM

[erhoo82]

LGTM

[guyueh1]

@erhoo82 need to trigger CICD? Though I think it isn't nececessary, no code under nemo/ is changed.

[guyueh1]

@erhoo82 what's next step for this? Need CI? thx.

[guyueh1]

@erhoo82 pls start CI for this, thx

[pablo-garay]

@erhoo82 pls start CI for this, thx

started