Fix some documentation error.

src/xlsx/xlsxabstractooxmlfile.cpp

@@ -45,7 +45,7 @@ AbstractOOXmlFilePrivate::~AbstractOOXmlFilePrivate()
 /*!
  * \internal
  *
- * \class OOXmlFile
+ * \class AbstractOOXmlFile
  *
  * Base class of all the ooxml part file.
  */

src/xlsx/xlsxabstractsheet.cpp

@@ -49,7 +49,7 @@ AbstractSheetPrivate::~AbstractSheetPrivate()
   \enum AbstractSheet::SheetType
 
   \value ST_WorkSheet,
-  \omitvalue ST_ChartSheet,
+  \value ST_ChartSheet,
   \omitvalue ST_DialogSheet,
   \omitvalue ST_MacroSheet
   */