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/tokenzr.h

@@ -136,7 +136,7 @@ public:
     wxString GetNextToken();
 
     /**
-        Returns the current position (i.e. one index after the last returned
+        Returns the current position (i.e.\ one index after the last returned
         token or 0 if GetNextToken() has never been called) in the original
         string.
     */