[PATCH] doc: Fix some typo errors in ras.rst

[Waiman Long <longman@redhat.com>]

Fix typo errors.

Signed-off-by: Waiman Long <longman@redhat.com>
---
 Documentation/admin-guide/ras.rst | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/Documentation/admin-guide/ras.rst b/Documentation/admin-guide/ras.rst
index 0310db624964..8b1803b2606f 100644
--- a/Documentation/admin-guide/ras.rst
+++ b/Documentation/admin-guide/ras.rst
@@ -156,10 +156,10 @@ the labels provided by the BIOS won't match the real ones.
 ECC memory
 ----------
 
-As mentioned on the previous section, ECC memory has extra bits to be
-used for error correction. So, on 64 bit systems, a memory module
-has 64 bits of *data width*, and 74 bits of *total width*. So, there are
-8 bits extra bits to be used for the error detection and correction
+As mentioned on the previous section, ECC memory has extra bits to
+be used for error correction. So, on 64 bit systems, a memory module
+has 64 bits of *data width*, and 72 bits of *total width*. So, there
+are 8 extra bits to be used for the error detection and correction
 mechanisms. Those extra bits are called *syndrome*\ [#f1]_\ [#f2]_.
 
 So, when the cpu requests the memory controller to write a word with
-- 
2.18.1