documentation: Correct other calculations of QPS

Like my earlier mistake on the same section of this file, I forgot
to divide by 60 to go from hours to minutes.

Change-Id: I3962a508abe4024fd52b610043b99a20a5efb427
Signed-off-by: Shawn O. Pearce <sop@google.com>
diff --git a/Documentation/dev-design.txt b/Documentation/dev-design.txt
index 27bc440..0353b09 100644
--- a/Documentation/dev-design.txt
+++ b/Documentation/dev-design.txt
@@ -517,7 +517,7 @@
 
 This WAG'd estimate boils down to <12,800 HTTP requests per day
 (QPD). Assuming these are evenly distributed over an 8 hour work day
-in a single time zone, we are looking at approximately 26 queries
+in a single time zone, we are looking at approximately 0.43 queries
 per second (QPS).
 
 ----
@@ -535,7 +535,7 @@
 
 Given a more realistic estimate of 79 changes per day (from the
 Linux kernel) suggests only 2,528 queries per day, and a much lower
-5.2 QPS when spread out over an 8 hour work day.
+0.08 QPS when spread out over an 8 hour work day.
 
 Disk Usage
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