Fix mismatched quote in a comment.
R=gri
APPROVED=gri
DELTA=1 (0 added, 0 deleted, 1 changed)
OCL=28184
CL=28192
diff --git a/src/lib/bignum.go b/src/lib/bignum.go
index 7aeda43..b9ea665 100755
--- a/src/lib/bignum.go
+++ b/src/lib/bignum.go
@@ -364,7 +364,7 @@
// used here.
//
// 1) D. Knuth, The Art of Computer Programming. Volume 2. Seminumerical
-// Algorithms." Addison-Wesley, Reading, 1969.
+// Algorithms. Addison-Wesley, Reading, 1969.
// (Algorithm D, Sec. 4.3.1)
//
// 2) Henry S. Warren, Jr., Hacker's Delight. Addison-Wesley, 2003.