[PATCH -perfbook 4/4] toolsoftrade: Fix QQz macro in QQz series

[Akira Yokosawa <akiyks@gmail.com>]

Final QQz in a QQz series start from "\QuickQuizE{" rather than
"\QuickQuizM{".

This typo resulted in an extra "," in the anchor box:

    +----------------------+
    | QQ 4.20, 4.21, 4.22, |
    +----------------------+

Fix it.

Fixes: a39fae0f30a9 ("treewide: Use macros for consecutive quick quizzes")
Signed-off-by: Akira Yokosawa <akiyks@gmail.com>
---
 toolsoftrade/toolsoftrade.tex | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/toolsoftrade/toolsoftrade.tex b/toolsoftrade/toolsoftrade.tex
index fee34ae8a1df..8c9384049e75 100644
--- a/toolsoftrade/toolsoftrade.tex
+++ b/toolsoftrade/toolsoftrade.tex
@@ -947,7 +947,7 @@ in fact degraded by about 10\,\% from ideal.
 	sections are described in \cref{chp:Deferred Processing}.
 }\QuickQuizEndM
 %
-\QuickQuizM{
+\QuickQuizE{
 	The system used is a few years old, and new hardware should
 	be faster.
 	So why should anyone worry about reader-writer locks being slow?
-- 
2.25.1