Added index entries to make it easier to locate directory operations.
diff --git a/Doc/lib/libos.tex b/Doc/lib/libos.tex
index 7856bb4..5568d48 100644
--- a/Doc/lib/libos.tex
+++ b/Doc/lib/libos.tex
@@ -87,6 +87,7 @@
\begin{funcdesc}{makedirs}{path\optional{, mode}}
\versionadded{1.5.2}
+\index{directory!creating}
Recursive directory creation function. Like \function{mkdir()},
but makes all intermediate-level directories needed to contain the
leaf directory. Throws an \exception{os.error} exception if the leaf
@@ -96,6 +97,7 @@
\begin{funcdesc}{removedirs}{path}
\versionadded{1.5.2}
+\index{directory!deleting}
Recursive directory removal function. Works like
\function{rmdir()} except that, if the leaf directory is
successfully removed, directories corresponding to rightmost path