[NFC] Fix trivial typos in comments

Reviewed By: jhenderson

Differential Revision: https://reviews.llvm.org/D72143

Patch by Kazuaki Ishizaki.
diff --git a/llvm/tools/llvm-objdump/MachODump.cpp b/llvm/tools/llvm-objdump/MachODump.cpp
index fc3503d..3d8f3d9 100644
--- a/llvm/tools/llvm-objdump/MachODump.cpp
+++ b/llvm/tools/llvm-objdump/MachODump.cpp
@@ -7730,7 +7730,7 @@
       }
     }
     // The TripleName's need to be reset if we are called again for a different
-    // archtecture.
+    // architecture.
     TripleName = "";
     ThumbTripleName = "";