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docs: correct the install and upgrade commands for 21.0.0-rc.1 #2847

Job	Run time
Build	49s
Contribute Node 20 (macos-latest)	3m 30s
Contribute Node 20 (ubuntu-latest)	2m 10s
Contribute Node 20 (windows-latest)	10m 43s
Test chrome-headless	1m 57s
Test firefox-headless	2m 6s
Test Node 20 (macos-latest)	1m 14s
Test Node 22 (macos-latest)	42s
Test Node 20 (windows-latest)	1m 16s
Test Node 20 (ubuntu-latest)	50s
Test Node 24 (ubuntu-latest)	36s
Test Node 24 (windows-latest)	1m 26s
Test Node 24 (macos-latest)	1m 5s
Test Node 22 (ubuntu-latest)	29s
Test Node 22 (windows-latest)	1m 31s
Publish (NPM)	0s
Branch protection	3s
	30m 27s