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

GitOrigin-RevId: 4cd6ca102a94e1b64ba3f940cc26b4d7b2b82964
diff --git a/include/float.h b/include/float.h
index 5c1e1db..399ab4f 100644
--- a/include/float.h
+++ b/include/float.h
@@ -90,4 +90,4 @@
 
 #endif // __cplusplus
 
-#endif  // _LIBCPP_FLOAT_H
+#endif // _LIBCPP_FLOAT_H