sw: doxygen comments for SwTxtFmtColl, SwFlowFrm, SwTxtFrm

sw/inc/fmtcol.hxx

@@ -57,6 +57,7 @@ private:
     const SwFmtColl &operator=(const SwFmtColl &);
 };
 
+/// Represents the style of a paragraph.
 class SW_DLLPUBLIC SwTxtFmtColl: public SwFmtColl
 {
     friend class SwDoc;

sw/source/core/inc/flowfrm.hxx

@@ -58,6 +58,7 @@ class SwObjectFormatterTxtFrm;
 
 void MakeFrms( SwDoc *, const SwNodeIndex &, const SwNodeIndex & );
 
+/// Base class for frames that are allowed at page breaks and shall continue on the next page, e.g. paragraphs, tables.
 class SwFlowFrm
 {
     //PrepareMake darf Locken/Unlocken (Robustheit)

sw/source/core/inc/txtfrm.hxx

@@ -62,6 +62,7 @@ class SwWrongList;
 #define RUBY_TOP        3
 #define GRID_CELLS      4
 
+/// Represents the visualization of a paragraph.
 class SwTxtFrm: public SwCntntFrm
 {
     friend class SwTxtIter;