fix typo


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36414 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/CREDITS.TXT b/CREDITS.TXT
index ef85424..e516de2 100644
--- a/CREDITS.TXT
+++ b/CREDITS.TXT
@@ -108,7 +108,7 @@
 
 N: Dale Johannesen
 E: dalej@apple.com
-D: ARM constant islands improvments
+D: ARM constant islands improvements
 
 N: Eric Kidd
 W: http://randomhacks.net/