wrappers: Update the comment about what unwind method is used on armv7

Since fcb784db496137fa29a11b7e106efe89c7550e11 in llvm-project
(Jun 6th), the armv7 target uses SEH.

wrappers/clang-target-wrapper.c

@@ -71,7 +71,7 @@ int _tmain(int argc, TCHAR* argv[]) {
     } else if (!_tcscmp(arch, _T("x86_64"))) {
         // SEH is the default for x86_64.
     } else if (!_tcscmp(arch, _T("armv7"))) {
-        // Dwarf is the default for armv7.
+        // SEH is the default for armv7.
     } else if (!_tcscmp(arch, _T("aarch64"))) {
         // SEH is the default for aarch64.
     }

wrappers/clang-target-wrapper.sh

@@ -65,7 +65,7 @@ x86_64)
     # SEH is the default for x86_64.
     ;;
 armv7)
-    # Dwarf is the default for armv7.
+    # SEH is the default for armv7.
     ;;
 aarch64)
     # SEH is the default for aarch64.