Add overlooked Goto Document Start/End shortcut settings

Change-Id: I2f60e2607660cea98aebb1057226010ea4837156
Reviewed-by: David Schulz <david.schulz@qt.io>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

src/plugins/texteditor/texteditor.cpp

@@ -1477,6 +1477,16 @@ void TextEditorWidget::gotoBlockEndWithSelection()
     }
 }
 
+void TextEditorWidget::gotoDocumentStart()
+{
+    moveCursor(QTextCursor::Start);
+}
+
+void TextEditorWidget::gotoDocumentEnd()
+{
+    moveCursor(QTextCursor::End);
+}
+
 void TextEditorWidget::gotoLineStart()
 {
     d->handleHomeKey(false);