📝 add more docs (#5231)

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

docs/mkdocs/docs/api/basic_json/get.md

@@ -155,6 +155,7 @@ overload (3).
 - [get_ptr](get_ptr.md) get a pointer to the stored value
 - [get_ref](get_ref.md) get a reference to the stored value
 - [operator ValueType](operator_ValueType.md) get a value via implicit conversion
+- [Converting values](../../features/conversions.md) - the type conversions article
 
 ## Version history