fix obscure markup error, wrapping a long line
diff --git a/Doc/inst/inst.tex b/Doc/inst/inst.tex
index 3cddba2..6002ad2 100644
--- a/Doc/inst/inst.tex
+++ b/Doc/inst/inst.tex
@@ -757,8 +757,8 @@
\label{config-filenames}
The names and locations of the configuration files vary slightly across
-platforms. On \UNIX and Mac OS X, the three configuration files (in the order they
-are processed) are:
+platforms. On \UNIX{} and Mac OS X, the three configuration files (in
+the order they are processed) are:
\begin{tableiii}{l|l|c}{textrm}
{Type of file}{Location and filename}{Notes}
\lineiii{system}{\filenq{\filevar{prefix}/lib/python\filevar{ver}/distutils/distutils.cfg}}{(1)}