[PATCH perfbook 3/3] indexsee: Lowercase "Heisenbug"

Looks like "heisenbug" is used as a normal noun.

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

diff --git a/indexsee.tex b/indexsee.tex
index 4cf02e10..bd80b56a 100644
--- a/indexsee.tex
+++ b/indexsee.tex
@@ -2,7 +2,7 @@
 \index{Full(y) multi-copy atomic|see{Multi-copy atomic}}
 \IfIndexHier{ % effective only in two-level index
 \index{Address dependency|see{Dependency, address}}
-\index{Anti-Heisenbug|see{Heisenbug, anti-}}
+\index{Anti-heisenbug|see{Heisenbug, anti-}}
 \index{Associativity|see{Cache associativity}}
 \index{Associativity miss|see{Cache miss, associativity}}
 \index{Bounded wait free|see{Wait free, bounded}}
-- 
2.34.1