📝 add more examples

docs/examples/get_allocator.cpp

@@ -0,0 +1,18 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    auto alloc = json::get_allocator();
+    using traits_t = std::allocator_traits<decltype(alloc)>;
+
+    json *j = traits_t::allocate(alloc, 1);
+    traits_t::construct(alloc, j, "Hello, world!");
+
+    std::cout << *j << std::endl;
+
+    traits_t::destroy(alloc, j);
+    traits_t::deallocate(alloc, j, 1);
+}

docs/examples/get_allocator.output

@@ -0,0 +1 @@
+"Hello, world!"

docs/mkdocs/docs/api/basic_json/get_allocator.md

@@ -10,10 +10,22 @@ Returns the allocator associated with the container.
 
 associated allocator
 
+## Examples
+
+??? example
+
+    The example shows how `get_allocator()` is used to created `json` values.
+    
+    ```cpp
+    --8<-- "examples/get_allocator.cpp"
+    ```
+    
+    Output:
+    
+    ```json
+    --8<-- "examples/get_allocator.output"
+    ```
+
 ## Version history
 
-- Unknown.
-
-!!! note
-
-    This documentation page is a stub.
+- Added in version 1.0.0.