fix typo

Author: JoshuaMoelans

platform-includes/performance/improving-data/native.mdx

@@ -50,13 +50,13 @@ sentry_transaction_t *tx =
 sentry_span_t *span =
     sentry_transaction_start_child(tx, "task", "operation");
 
-sentry_span_set_data(child, "my-data-attribute-1",
+sentry_span_set_data(span, "my-data-attribute-1",
     sentry_value_new_string("value1"));
-sentry_span_set_data(child, "my-data-attribute-2",
+sentry_span_set_data(span, "my-data-attribute-2",
     sentry_value_new_int32(42));
-sentry_span_set_data(child, "my-data-attribute-3",
+sentry_span_set_data(span, "my-data-attribute-3",
     sentry_value_new_double(3.14));
-sentry_span_set_data(child, "my-data-attribute-4",
+sentry_span_set_data(span, "my-data-attribute-4",
     sentry_value_new_bool(true));
 
 sentry_value_t value_list = sentry_value_new_list();
@@ -65,7 +65,7 @@ sentry_value_append(value_list, sentry_value_new_int32(42));
 sentry_value_append(value_list, sentry_value_new_double(3.14));
 sentry_value_append(value_list, sentry_value_new_bool(true));
 
-sentry_span_set_data(child, "my-data-attribute-5",
+sentry_span_set_data(span, "my-data-attribute-5",
     value_list);
 
 sentry_value_t value_object = sentry_value_new_object();
@@ -74,6 +74,6 @@ sentry_value_set_by_key(value_object, "key_2", sentry_value_new_int32(42));
 sentry_value_set_by_key(value_object, "key_3", sentry_value_new_double(3.14));
 sentry_value_set_by_key(value_object, "key_4", sentry_value_new_bool(true));
 
-sentry_span_set_data(child, "my-data-attribute-6",
+sentry_span_set_data(span, "my-data-attribute-6",
     value_object);
 ```