Escape space after "e.g." or "i.e." in the manual.

This fixes formatting of the Doxygen-generated docs (maybe we should just
switch to the civilized spelling of "eg" and "ie" instead?).

See #16744.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78308 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/htmllbox.h

@@ -123,7 +123,7 @@ protected:
 
     /**
         This method must be implemented in the derived class and should return
-        the body (i.e. without @c html nor @c body tags) of the HTML fragment
+        the body (i.e.\ without @c html nor @c body tags) of the HTML fragment
         for the given item.
 
         Note that this function should always return a text fragment for the @a n item