[NFC][COFF] fix typo in comment ("algortihm" -> "algorithm")

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@372776 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/COFF/ICF.cpp b/COFF/ICF.cpp
index 2b2818d..abd7193 100644
--- a/COFF/ICF.cpp
+++ b/COFF/ICF.cpp
@@ -13,7 +13,7 @@
 //
 // On Windows, ICF is enabled by default.
 //
-// See ELF/ICF.cpp for the details about the algortihm.
+// See ELF/ICF.cpp for the details about the algorithm.
 //
 //===----------------------------------------------------------------------===//