[libc++] NFC: Normalize `#endif //` comment indentation

GitOrigin-RevId: 4cd6ca102a94e1b64ba3f940cc26b4d7b2b82964
diff --git a/include/tgmath.h b/include/tgmath.h
index 2dc1f77..ba9396e 100644
--- a/include/tgmath.h
+++ b/include/tgmath.h
@@ -31,6 +31,6 @@
 
 #include_next <tgmath.h>
 
-#endif  // __cplusplus
+#endif // __cplusplus
 
-#endif  // _LIBCPP_TGMATH_H
+#endif // _LIBCPP_TGMATH_H