docs: fix typo - it's -> its (#1566) #1126

Job	Run time
js-test-and-release / check	1m 24s
js-test-and-release / test-chrome-webworker	31s
js-test-and-release / test-firefox	37s
js-test-and-release / test-chrome	30s
js-test-and-release / test-node (windows-latest, lts/*)	3m 36s
js-test-and-release / test-node (ubuntu-latest, lts/*)	2m 34s
js-test-and-release / test-electron-main	36s
js-test-and-release / test-firefox-webworker	29s
js-test-and-release / test-webkit (ubuntu-latest, lts/*)	40s
js-test-and-release / test-node (macos-latest, lts/*)	3m 45s
js-test-and-release / test-webkit (macos-latest, lts/*)	1m 36s
js-test-and-release / test-webkit-webworker (ubuntu-latest, lts/*)	1m 6s
js-test-and-release / test-webkit-webworker (macos-latest, lts/*)	1m 43s
js-test-and-release / test-electron-renderer	17s
js-test-and-release / release-check	3s
js-test-and-release / release	54s
	20m 21s

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