Remove faulty since tag at FindReplaceOverlay

The FindReplaceOverlay is not part of API and was introduced in current
version (3.18.0) but has a since tag for 3.17. This change removes the
obsolete and incorrect tag.

Author: HeikoKlare

bundles/org.eclipse.ui.workbench.texteditor/src/org/eclipse/ui/internal/findandreplace/overlay/FindReplaceOverlay.java

@@ -74,9 +74,6 @@
 import org.eclipse.ui.texteditor.IAbstractTextEditorHelpContextIds;
 import org.eclipse.ui.texteditor.StatusTextEditor;
 
-/**
- * @since 3.17
- */
 public class FindReplaceOverlay extends Dialog {
 	private final class KeyboardShortcuts {
 		private static final List<KeyStroke> SEARCH_FORWARD = List.of( //