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/region.h

@@ -322,7 +322,7 @@ public:
     virtual bool IsEmpty() const;
 
     /**
-        Returns @true if the region is equal to, i.e. covers the same area as,
+        Returns @true if the region is equal to, i.e.\ covers the same area as,
         another one.
 
         If both this region and @a region are both invalid, they are considered