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docs: correct the install and upgrade commands for 21.0.0-rc.1 #2852

Job	Run time
Contribute Node 20 (ubuntu-latest)	3m 1s
Contribute Node 20 (macos-latest)	3m 12s
Build	49s
Contribute Node 20 (windows-latest)	13m 55s
Test firefox-headless	1m 38s
Test chrome-headless	1m 57s
Test Node 24 (windows-latest)	1m 28s
Test Node 22 (macos-latest)	1m 5s
Test Node 24 (ubuntu-latest)	43s
Test Node 20 (macos-latest)	55s
Test Node 20 (windows-latest)	1m 36s
Test Node 20 (ubuntu-latest)	49s
Test Node 24 (macos-latest)	57s
Test Node 22 (windows-latest)	1m 23s
Test Node 22 (ubuntu-latest)	44s
Publish (NPM)	0s
Branch protection	4s
	34m 16s