Add comments for transformClass #2194

Job	Run time
test262 - Prepare for running in parallel	0s
Build Babel Artifacts on Windows	1m 44s
Prepare Cache	22s
Validate Yarn dependencies and constraints	24s
Test ESM version	2m 7s
Build Babel 8 Artifacts	5m 21s
Build Babel Artifacts	1m 16s
Test on Node.js Latest	2m 46s
Lint	4m 52s
Test on (windows-latest)	2m 15s
Third-party Parser Tests	1m 41s
Test on (macos-latest)	1m 15s
Test on Node.js (20)	1m 35s
Test @babel/eslint-* with ESLint 7.5.0	38s
Test @babel/eslint-* with ESLint 8.0.0	35s
Test on Node.js (18)	1m 35s
Test @babel/runtime integrations	1m 13s
Test on Node.js (16)	1m 41s
Test on Node.js (14)	1m 41s
test262	0s
Test on Node.js (12)	1m 54s
Test on Node.js (10)	2m 42s
Test on Node.js (8)	3m 21s
Test on Node.js (6)	4m 18s
test262 - Analyze results	0s
Test Babel 8 breaking changes on (ubuntu-latest)	1m 40s
Test Babel 8 breaking changes on (windows-latest)	2m 35s
Test Babel 8 breaking changes on (macos-latest)	2m 23s
	51m 54s

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