[PATCH 1/2] introduction: clarify rings do both input and output (not either/or)

["Michael S. Tsirkin" <mst@redhat.com>]

Suggested by Rusty.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 introduction.tex | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/introduction.tex b/introduction.tex
index 221e24e..b93934f 100644
--- a/introduction.tex
+++ b/introduction.tex
@@ -13,7 +13,7 @@ inter-guest communication) requires copying.
 }
 
   Efficient: Virtio devices consist of rings of descriptors
-  for input and output, which are neatly separated to avoid cache
+  for both input and output, which are neatly separated to avoid cache
   effects from both driver and device writing to the same cache
   lines.
 
-- 
MST