sf #1009373, #1005936. fix underscores in index entries in PDF files.
I couldn't test this, but it didn't break anything and the patch
reported fixed the problem.

Bugfix candidate.
diff --git a/Misc/NEWS b/Misc/NEWS
index 6b1dcff..bc77b7d 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -140,9 +140,12 @@
 Documentation
 -------------
 
-- bug #990669: os.path.normpath may alter the meaning of a path if it contains
-symbolic links. This has been documented in a comment since 1992, but is now in
-the library reference as well.
+- patch #1005936, bug #1009373: fix index entries which contain
+  an underscore when viewed with Acrobat.
+
+- bug #990669: os.path.normpath may alter the meaning of a path if
+  it contains symbolic links. This has been documented in a comment
+  since 1992, but is now in the library reference as well.
 
 New platforms
 -------------