Update documentation

examples/xlsx/hello/doc/src/hello.qdoc

@@ -1,20 +1,22 @@
 /*!
     \example hello
-    \title Xlsx Hello Example
-    \brief This is a simplest xlsx examples.
+    \title Hello QtXlsx Example
+    \brief This is a simplest Qt Xlsx example.
     \ingroup qtxlsx-examples
 
-    This example demonstrates how to generate a
-    simplest .xlsx file with Qt Xlsx Library.
+    This example demonstrates how to create a new
+     .xlsx file containing some basic data and calculations
+    with Qt Xlsx Library. So lets see how this is achieved.
     \image hello.png
 
-    Create an object of the class QXlsx::Document.
+    This creates a new instance of the all important Document
+    class which gives you access to the Excel workbook and worksheets.
     \snippet hello/main.cpp 0
 
-    Set the cells of worksheet.
+    A default worksheet have been created by Document. Let's start
+    by adding some basic data.
     \snippet hello/main.cpp 1
 
-    Save it.
+    Now save the file and all its components.
     \snippet hello/main.cpp 2
-
 */