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/sizer.h

@@ -642,7 +642,7 @@ public:
     bool IsShown(size_t index) const;
 
     /**
-        Call this to force layout of the children anew, e.g. after having added a child
+        Call this to force layout of the children anew, e.g.\ after having added a child
         to or removed a child (window, other sizer or space) from the sizer while
         keeping the current dimension.
     */