Issue #3461155 by quietone, smustgrave: More spelling fixes, 22 words, in tests

...al/KernelTests/Core/Cache/EndOfTransactionQueriesTest.php

...sts/Drupal/KernelTests/Core/Routing/RouteProviderTest.php

...Drupal/TestSite/TestSiteMultilingualInstallTestScript.php

...upal/Tests/Composer/Plugin/VendorHardening/ConfigTest.php

core/tests/Drupal/Tests/Core/Entity/EntityLinkTest.php

...rupal/Tests/Core/EventSubscriber/RssResponseCdataTest.php

...Core/EventSubscriber/RssResponseRelativeUrlFilterTest.php

core/tests/Drupal/Tests/Core/Routing/RouteCompilerTest.php

core/tests/README.md