add example sentry_value_t usage for setting context

Author: JoshuaMoelans

platform-includes/enriching-events/set-context/native.mdx

@@ -4,6 +4,14 @@
 sentry_value_t character = sentry_value_new_object();
 sentry_value_set_by_key(character, "name", sentry_value_new_string("Mighty Fighter"));
 sentry_value_set_by_key(character, "age", sentry_value_new_int32(19));
-sentry_value_set_by_key(character, "attack_type", sentry_value_new_string("melee"));
+sentry_value_set_by_key(character, "height", sentry_value_new_double(184.6));
+sentry_value_set_by_key(character, "is_alive", sentry_value_new_bool(true));
+sentry_value_set_by_key(character, "exp", sentry_value_new_uint64(6442450941));
+
+sentry_value_t inventory = sentry_value_new_list();
+sentry_value_append(inventory, sentry_value_new_string("sword"));
+sentry_value_append(inventory, sentry_value_new_string("shield"));
+sentry_value_set_by_key(character, "inventory", inventory);
+
 sentry_set_context("character", character);
 ```