Fix spelling of `iterative scan'

llvm-svn: 15075
diff --git a/llvm/docs/CommandGuide/llc.pod b/llvm/docs/CommandGuide/llc.pod
index c1b451c..19d5efa 100644
--- a/llvm/docs/CommandGuide/llc.pod
+++ b/llvm/docs/CommandGuide/llc.pod
@@ -141,7 +141,7 @@
 
 Linear scan global register allocator
 
-=item I<iterativerscan>
+=item I<iterativescan>
 
 Iterative scan global register allocator