Normalized the \seetext markup to match the only other instance: should be
"\seetext{...}" instead of "\seetext ...".
diff --git a/Doc/lib/libre.tex b/Doc/lib/libre.tex
index f9f4871..208f8d1 100644
--- a/Doc/lib/libre.tex
+++ b/Doc/lib/libre.tex
@@ -578,10 +578,10 @@
\end{datadesc}
\begin{seealso}
-\seetext Jeffrey Friedl, \emph{Mastering Regular Expressions},
+\seetext{Jeffrey Friedl, \emph{Mastering Regular Expressions},
O'Reilly. The Python material in this book dates from before the re
module, but it covers writing good regular expression patterns in
-great detail.
+great detail.}
\end{seealso}