Weaken recommendation of Friedl book; fix reference

Doc/lib/libre.tex

@@ -35,9 +35,9 @@ string notation.
 
 \begin{seealso}
   \seetitle{Mastering Regular Expressions}{Book on regular expressions
-            by Jeffrey Friedl, published by O'Reilly.  The Python
-            material in this book dates from before the \refmodule{re}
-            module, but it covers writing good regular expression
+            by Jeffrey Friedl, published by O'Reilly.  The second 
+            edition of the book no longer covers Python at all, 
+            but the first edition covered writing good regular expression
             patterns in great detail.}
 \end{seealso}
 
@@ -58,7 +58,7 @@ conditions that are no longer satisfied by \emph{pq}.  Thus, complex
 expressions can easily be constructed from simpler primitive
 expressions like the ones described here.  For details of the theory
 and implementation of regular expressions, consult the Friedl book
-referenced below, or almost any textbook about compiler construction.
+referenced above, or almost any textbook about compiler construction.
 
 A brief explanation of the format of regular expressions follows.  For
 further information and a gentler presentation, consult the Regular