Fix PythonNode examples in docs. (#604)

Author: tobiasraabe

docs/source/changes.md

@@ -45,6 +45,7 @@ releases are available on [PyPI](https://pypi.org/project/pytask) and
 - {pull}`599` adds a test fixture for switching the cwd.
 - {pull}`600` refactors test using subprocesses.
 - {pull}`603` fixes an example in the documentation about capturing warnings.
+- {pull}`604` fixes some examples with `PythonNode`s in the documentation.
 
 ## 0.4.7 - 2024-03-19
 

docs_src/how_to_guides/hashing_inputs_of_tasks_example_2_py310.py

@@ -6,7 +6,7 @@
 
 
 def task_example(
-    text: Annotated[str, PythonNode("Hello, World", hash=True)],
+    text: Annotated[str, PythonNode(value="Hello, World", hash=True)],
     path: Annotated[Path, Product] = Path("file.txt"),
 ) -> None:
     path.write_text(text)

docs_src/how_to_guides/hashing_inputs_of_tasks_example_3_py310.py

@@ -12,7 +12,7 @@ def calculate_hash(x: Any) -> str:
     return DeepHash(x)[x]
 
 
-node = PythonNode({"a": 1, "b": 2}, hash=calculate_hash)
+node = PythonNode(value={"a": 1, "b": 2}, hash=calculate_hash)
 
 
 def task_example(