Merged changes from the 1.5.2p2 release.
(Very rough.)
diff --git a/Doc/lib/libfileinput.tex b/Doc/lib/libfileinput.tex
index 8bc93af..97caaf9 100644
--- a/Doc/lib/libfileinput.tex
+++ b/Doc/lib/libfileinput.tex
@@ -75,11 +75,13 @@
 \end{funcdesc}
 
 \begin{funcdesc}{isfirstline}{}
-  Return true iff the line just read is the first line of its file.
+  Returns true the line just read is the first line of its file,
+  otherwise returns false.
 \end{funcdesc}
 
 \begin{funcdesc}{isstdin}{}
-  Returns true iff the last line was read from \code{sys.stdin}.
+  Returns true if the last line was read from \code{sys.stdin},
+  otherwise returns false.
 \end{funcdesc}
 
 \begin{funcdesc}{nextfile}{}