docs: Bugs in the provided example of Data Classes - StreamingChunk

[TaMaN2031A]

Describe the bug
There is a missing import in the code snippet of this example: ToolCallDelta. There is also a missing required argument in the StreamingChunk, which is content. There is an unnecessary ComponentInfo import.

Error message
NameError: name 'ToolCallDelta' is not defined
and
TypeError: StreamingChunk.__init__() missing 1 required positional argument: 'content'

Expected behavior
The code should run successfully.

To Reproduce
Run the code directly, and it will produce the first error. To produce the second, write the needed import.

FAQ Check

• Yes [ ] Have you had a look at our new FAQ page?

System:

• OS: WSL-Ubuntu on Windows 11
• GPU/CPU: Not important
• Haystack version (commit or version number): 2.19.0