docs: Run vs Initialization parameters

[TuanaCelik]

When we first started creating the Haystack 2.0 docs we had a standard for making sure we list the inputs for the component torun() the component as well as the Parameters/Initialization Parameter But I don't think we do this anymore.

It would be super useful if we did this consistently.

Example: DocumentWriter This component expects documents to run, but expects a document_store at initialization. This fact is only shown in the code snippet.

[aantti]

I second this. Was stumped for a while trying to figure it out.

[Boben19]

Yess

[dfokina]

I introduced the changes with the new component table format. The changes are live from v.2.6 onward.

Example: https://docs.haystack.deepset.ai/v2.6-unstable/docs/documentwriter