docs: improve toHaveClass paramter description #28552

Job	Run time
ubuntu-20.04 (chromium tip-of-tree)	16m 48s
Web Components	14m 23s
Installation Test ubuntu-latest	12m 34s
ubuntu-22.04 (chromium - Node.js 18)	12m 43s
VSCode Extension	31m 49s
Installation Test macos-latest	10m 48s
Test Runner (ubuntu-latest, 18, 1, 2)	30m 18s
ubuntu-22.04 (firefox - Node.js 18)	26m 22s
Installation Test windows-latest	17m 53s
Test Runner (ubuntu-latest, 18, 2, 2)	6m 0s
ubuntu-22.04 (webkit - Node.js 18)	35m 29s
Test Runner (windows-latest, 18, 1, 2)	41m 24s
ubuntu-22.04 (chromium - Node.js 20)	12m 43s
Test Runner (windows-latest, 18, 2, 2)	10m 31s
ubuntu-22.04 (chromium - Node.js 22)	12m 42s
Test Runner (macos-latest, 18, 1, 2)	20m 39s
Test Runner (macos-latest, 18, 2, 2)	6m 4s
Test Runner (ubuntu-latest, 20, 1, 2)	27m 40s
Test Runner (ubuntu-latest, 20, 2, 2)	14m 4s
Test Runner (ubuntu-latest, 22, 1, 2)	30m 0s
Test Runner (ubuntu-latest, 22, 2, 2)	5m 45s
	6h 36m 39s

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