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/gdicmn.h

@@ -954,9 +954,8 @@ public:
     void Set(int width, int height);
 
     /**
-        Combine this size object with another one replacing the default (i.e.
-        equal to -1) components of this object with those of the other. It is
-        typically used like this:
+        Combine this size object with another one replacing the default (i.e.\ equal to -1)
+        components of this object with those of the other. It is typically used like this:
 
         @code
         if ( !size.IsFullySpecified() )