Minor grammar fix, and clarification

Doc/lib/libsite.tex

@@ -22,8 +22,8 @@ the tail part, it uses the empty string (on Macintosh or Windows) or
 it uses first \file{lib/python\shortversion/site-packages} and then
 \file{lib/site-python} (on \UNIX).  For each of the distinct
 head-tail combinations, it sees if it refers to an existing directory,
-and if so, adds to \code{sys.path}, and also inspects the path for
-configuration files.
+and if so, adds it to \code{sys.path} and also inspects the newly added 
+path for configuration files.
 \indexii{site-python}{directory}
 \indexii{site-packages}{directory}