[PATCH -perfbook 2/2] glossary: Fix warning from "make punctcheck"

"make checkpunct" says:
Hint: Break at end of sentence or mark mid-sentece punct as such (xxx.\@).
./glossary.tex:158:	overlapping categories, for example, read misses vs. write misses

Fix it.

Signed-off-by: Akira Yokosawa <[email protected]>
---
 glossary.tex | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/glossary.tex b/glossary.tex
index 1811c5cb..a7bc20cb 100644
--- a/glossary.tex
+++ b/glossary.tex
@@ -155,7 +155,7 @@
 	in other CPUs' caches (``write'' miss).
 	\end{enumerate*}
 	Note that cache misses can be split into multiple partially
-	overlapping categories, for example, read misses vs. write misses
+	overlapping categories, for example, read misses vs.\@ write misses
 	as opposed to the above categorization.
 \item[\IXGalth{Capacity Miss}{capacity}{cache miss}:]
 	A cache miss incurred because the corresponding CPU has recently
-- 
2.34.1