Fix premature truncation of brief descriptions in Doxygen comments.

Don't end the brief description at the first period if it's a period which is
part of "i.e." or "e.g.": escape the space following it to prevent Doxygen
from recognizing it as an end of sentence.

See #14866.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73084 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/dataview.h

@@ -259,7 +259,7 @@ public:
     bool HasValue(const wxDataViewItem& item, unsigned col) const;
 
     /**
-        Override this to indicate of @a item is a container, i.e. if
+        Override this to indicate of @a item is a container, i.e.\ if
         it can have child items.
     */
     virtual bool IsContainer(const wxDataViewItem& item) const = 0;