Issue #3510836 by globexplorer, think modular: Several typos in code

flexible_access.module

src/EntityAccessHelper.php

src/FlexibleAccessGroupRelationshipAccessUpdate.php

src/Plugin/FlexibleAccessItem/DefaultCommunity.php

src/Plugin/FlexibleAccessItem/DefaultCommunityRoles.php

src/Plugin/FlexibleAccessItem/DefaultMember.php

src/Plugin/FlexibleAccessItem/DefaultPublic.php

src/Plugin/FlexibleAccessItemInterface.php