Don't break a long line at an unpleasant point.
diff --git a/Doc/lib/libposixfile.tex b/Doc/lib/libposixfile.tex
index 3b7c014..3d1fad1 100644
--- a/Doc/lib/libposixfile.tex
+++ b/Doc/lib/libposixfile.tex
@@ -53,8 +53,7 @@
The posixfile object defines the following additional methods:
\renewcommand{\indexsubitem}{(posixfile method)}
-\begin{funcdesc}{lock}{fmt\, \optional{len\optional{\, start
-\optional{\, whence}}}}
+\begin{funcdesc}{lock}{fmt\, \optional{len\optional{\, start\optional{\, whence}}}}
Lock the specified section of the file that the file object is
referring to. The format is explained
below in a table. The \var{len} argument specifies the length of the