Improve the documentation of the examples

examples/xlsx/hello/main.cpp

@@ -1,38 +1,23 @@
 #include <QtCore>
 #include "xlsxdocument.h"
 
-#ifdef Q_OS_MAC
-#  define DATA_PATH "../../../"
-#else
-#  define DATA_PATH "./"
-#endif
-
 int main()
 {
+    //![0]
     QXlsx::Document xlsx;
+    //![0]
 
-    //Write to first worksheet.
+    //![1]
     xlsx.write("A1", "Hello Qt!");
-    xlsx.write("B3", 12345);
-    xlsx.write("C5", "=44+33");
-    xlsx.write("D7", true);
-    xlsx.write("E1", "http://qt-project.org");
+    xlsx.write("A2", 12345);
+    xlsx.write("A3", "=44+33");
+    xlsx.write("A4", true);
+    xlsx.write("A5", "http://qt-project.org");
+    //![1]
 
-    //Create another worksheet.
-    xlsx.addWorksheet();
-    //Rows and columns are zero indexed.
-    //The first cell in a worksheet, "A1", is (0, 0).
-    xlsx.write(0, 0, "First");
-    xlsx.write(1, 0, "Second");
-    xlsx.write(2, 0, "Third");
-    xlsx.write(3, 0, "Fourth");
-    xlsx.write(4, 0, "Total");
-    xlsx.write(0, 1, 100);
-    xlsx.write(1, 1, 200);
-    xlsx.write(2, 1, 300);
-    xlsx.write(3, 1, 400);
-//    xlsx.write(4, 1, "=SUM(B1:B4)");
+    //![2]
+    xlsx.save();
+    //![2]
 
-    xlsx.saveAs(DATA_PATH"Test.xlsx");
     return 0;
 }