Issue #3405899 by quietone, smustgrave: Fix spelling of heredoc indentifiers

core/lib/Drupal/Core/Command/DbDumpCommand.php

core/misc/cspell/dictionary.txt

...ion/tests/src/Functional/ConfigTranslationInstallTest.php

...help/tests/src/Functional/HelpTopicTranslatedTestBase.php

.../tests/src/Functional/LocaleNonInteractiveInstallTest.php

...ami/tests/src/Functional/UmamiMultilingualInstallTest.php

core/scripts/dump-database-d6.sh

core/scripts/dump-database-d7.sh

...sts/Installer/DistributionProfileTranslationQueryTest.php

...nalTests/Installer/DistributionProfileTranslationTest.php

.../InstallerExistingConfigSyncDirectoryMultilingualTest.php

...lTests/Installer/InstallerTranslationExistingFileTest.php

...nstallerTranslationMultipleLanguageNonInteractiveTest.php

...ts/Installer/InstallerTranslationMultipleLanguageTest.php

...nctionalTests/Installer/InstallerTranslationQueryTest.php

...al/FunctionalTests/Installer/InstallerTranslationTest.php

.../tests/Drupal/Tests/Core/Extension/InfoParserUnitTest.php