Merge branch 'json-view/08-view-builder' into json-view/10-view-document

Conflicts in the See also lists of nine basic_json pages, is_discarded.md, and features/index.md, where develop (#5638) and this branch both added entries: kept both. Ran make amalgamate.

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

docs/mkdocs/docs/api/basic_json/is_discarded.md

@@ -55,7 +55,7 @@ with `allow_exceptions` set to `#!cpp false`: a parse error then yields a discar
 
 ## Examples
 
-??? example
+??? example "Example: `is_discarded()` for ordinary JSON values"
 
     The following code exemplifies `is_discarded()` for all JSON types.
     
@@ -69,6 +69,22 @@ with `allow_exceptions` set to `#!cpp false`: a parse error then yields a discar
     --8<-- "examples/is_discarded.output"
     ```
 
+??? example "Example: discarded values from parsing"
+
+    The following code shows the two situations in which a discarded value can be observed: parsing invalid JSON with
+    `allow_exceptions` set to `#!cpp false`, and a parser callback that discards the top-level value (which is replaced
+    by `#!json null` and therefore does *not* remain discarded).
+
+    ```cpp
+    --8<-- "examples/is_discarded__parse.cpp"
+    ```
+
+    Output:
+
+    ```json
+    --8<-- "examples/is_discarded__parse.output"
+    ```
+
 ## See also
 
 - [basic_json_view::is_discarded](../basic_json_view/is_discarded.md) - the corresponding check on a zero-copy view,