[tools] Fix typo in comment

Change-Id: Ib8ae57f070bd6c3f99ae6a1d6a3a4c530e41fef8
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/147800
Commit-Queue: James Price <jrprice@google.com>
Auto-Submit: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: James Price <jrprice@google.com>
diff --git a/tools/src/cnf/decompose.go b/tools/src/cnf/decompose.go
index 3b01ce8..5037b36 100644
--- a/tools/src/cnf/decompose.go
+++ b/tools/src/cnf/decompose.go
@@ -31,7 +31,7 @@
 // hold the deduplicated AND expressions, otherwise Decomposed.Ands will be
 // empty.
 // If e has two or more Unary expressions OR'd together, then Decomposed.ORs
-// will hold the deduplicated OR expressions, otherwise Decomposed.Ands will be
+// will hold the deduplicated OR expressions, otherwise Decomposed.ORs will be
 // empty.
 // Decomposed.Unarys will hold all the deduplicated Unary expressions.
 func Decompose(e Expr) Decomposed {