🔥 consolidate documentation

doc/mkdocs/docs/api/json.md

@@ -3,3 +3,10 @@
 ```cpp
 using json = basic_json<>;
 ```
+
+This type is the default specialization of the [basic_json](basic_json/index.md) class which uses the standard template
+types.
+
+## Version history
+
+Since version 1.0.0.

doc/mkdocs/docs/api/ordered_json.md

@@ -3,3 +3,13 @@
 ```cpp
 using ordered_json = basic_json<nlohmann::ordered_map>;
 ```
+
+This type preserves the insertion order of object keys.
+
+## See also
+
+- [ordered_map](ordered_map.md)
+
+## Version history
+
+Since version 3.9.0.

doc/mkdocs/docs/features/parsing/sax_interface.md

@@ -66,3 +66,8 @@ To implement your own SAX handler, proceed as follows:
 3. Call `#!cpp bool json::sax_parse(input, &my_sax);` where the first parameter can be any input like a string or an input stream and the second parameter is a pointer to your SAX interface.
 
 Note the `sax_parse` function only returns a `#!cpp bool` indicating the result of the last executed SAX event. It does not return `json` value - it is up to you to decide what to do with the SAX events. Furthermore, no exceptions are thrown in case of a parse error - it is up to you what to do with the exception object passed to your `parse_error` implementation. Internally, the SAX interface is used for the DOM parser (class `json_sax_dom_parser`) as well as the acceptor (`json_sax_acceptor`), see file `json_sax.hpp`.
+
+## See also
+
+- [json_say](../../api/json_sax/index.md) - documentation of the SAX interface
+- [sax_parse](../../api/basic_json/sax_parse.md) - SAX parser