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Fix "Unspammed" spelling in `wp user unspam` docs #1264

Job	Run time
code-quality / Lint GitHub Actions workflows	14s
code-quality / PHPCS	34s
code-quality / Spell check	6s
code-quality / Lint Gherkin Feature files	29s
code-quality / PHPStan	40s
code-quality / Lint PHP files	28s
	2m 31s