Simplify module API (#4840)

* Simplify module API

Signed-off-by: Miko <110693261+mikomikotaishi@users.noreply.github.com>

* Forgot missing newline

Signed-off-by: Miko <110693261+mikomikotaishi@users.noreply.github.com>

---------

Signed-off-by: Miko <110693261+mikomikotaishi@users.noreply.github.com>

docs/mkdocs/docs/features/modules.md

@@ -25,6 +25,7 @@ json data = json::parse(f);
 
 ## Modules do not export macros
 It should be noted that as modules do not export macros, the `nlohmann.json` module will not export any macros, but rather only the following symbols:
+
 - `nlohmann::adl_serializer`
 - `nlohmann::basic_json`
 - `nlohmann::json`

src/modules/json.cppm

@@ -5,18 +5,10 @@ module;
 export module nlohmann.json;
 
 export namespace nlohmann {
-    template <typename T = void, typename SFINAE = void>
+    using ::nlohmann::adl_serializer;
-    using adl_serializer = ::nlohmann::adl_serializer<T, SFINAE>;
+    using ::nlohmann::basic_json;
-
+    using ::nlohmann::json;
-    using basic_json = ::nlohmann::basic_json<>;
+    using ::nlohmann::json_pointer;
-
-    using json = ::nlohmann::json;
-
-    template <typename RefStringType>
-    using json_pointer = ::nlohmann::json_pointer<RefStringType>;
-
     using ::nlohmann::ordered_json;
-
+    using ::nlohmann::ordered_map;
-    template <class Key, class T, class IgnoredLess, class Allocator>
-    using ordered_map = ::nlohmann::ordered_map<Key, T, IgnoredLess, Allocator>;
 }  // namespace nlohmann