Issue #1313980 by Albert Volkman, Lars Toomre, jn2, xjm: Massive API docs cleanup for Node module

core/modules/node/content_types.inc

core/modules/node/content_types.js

.../modules/node/lib/Drupal/node/Plugin/Core/Entity/Node.php

...b/Drupal/node/Tests/MultiStepNodeFormBasicOptionsTest.php

...es/node/lib/Drupal/node/Tests/NodeAccessBaseTableTest.php

...les/node/lib/Drupal/node/Tests/NodeAccessLanguageTest.php

...ules/node/lib/Drupal/node/Tests/NodeAccessRebuildTest.php

...ules/node/lib/Drupal/node/Tests/NodeAccessRecordsTest.php

core/modules/node/lib/Drupal/node/Tests/NodeAccessTest.php

core/modules/node/lib/Drupal/node/Tests/NodeAdminTest.php

...es/node/lib/Drupal/node/Tests/NodeBlockFunctionalTest.php

core/modules/node/lib/Drupal/node/Tests/NodeBlockTest.php

...dules/node/lib/Drupal/node/Tests/NodeBuildContentTest.php

core/modules/node/lib/Drupal/node/Tests/NodeCreationTest.php

core/modules/node/lib/Drupal/node/Tests/NodeFeedTest.php

...e/lib/Drupal/node/Tests/NodeFieldMultilingualTestCase.php

...dules/node/lib/Drupal/node/Tests/NodePostSettingsTest.php

...modules/node/lib/Drupal/node/Tests/NodeQueryAlterTest.php

...modules/node/lib/Drupal/node/Tests/NodeRSSContentTest.php

.../modules/node/lib/Drupal/node/Tests/NodeRevisionsTest.php