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docs: correct the install and upgrade commands for 21.0.0-rc.1 #2850

Job	Run time
Build	41s
Contribute Node 20 (ubuntu-latest)	1m 35s
Contribute Node 20 (windows-latest)	6m 0s
Contribute Node 20 (macos-latest)	3m 11s
Test firefox-headless	1m 50s
Test chrome-headless	2m 16s
Test Node 20 (ubuntu-latest)	43s
Test Node 20 (macos-latest)	1m 0s
Test Node 22 (macos-latest)	48s
Test Node 22 (ubuntu-latest)	37s
Test Node 24 (macos-latest)	40s
Test Node 24 (windows-latest)	1m 36s
Test Node 24 (ubuntu-latest)	31s
Test Node 22 (windows-latest)	1m 31s
Test Node 20 (windows-latest)	1m 30s
Publish (NPM)	0s
Branch protection	3s
	24m 32s