Improve description for generation config parameters #10608

Job	Run time
Integration Tests (A)	56m 51s
Integration Tests (C)	36m 32s
Integration Tests (B)	1h 17m 44s
py3.8, torch-1.13.0, not distributed, ubuntu-latest, ray 2.2.0	22m 46s
py3.8, torch-1.13.0, distributed, ubuntu-latest, ray 2.2.0	1h 6m 12s
py3.9, torch-2.0.0, not distributed, ubuntu-latest, ray 2.3.0	23m 25s
py3.9, torch-2.0.0, distributed, ubuntu-latest, ray 2.3.0	50m 55s
py3.10, torch-nightly, not distributed, ubuntu-latest, ray 2.3.1	23m 39s
py3.10, torch-nightly, distributed, ubuntu-latest, ray 2.3.1	27m 57s
Combinatorial Tests	21m 33s
Integration Tests (D)	42m 33s
LLM Tests	15m 50s
Event File	2s
Test Minimal Install	5m 55s
	7h 51m 54s

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