docs: fix _merge_super_component_pipelines return description

[Morningstar202604]

Fixes #12656.

Corrects the :returns: section of _merge_super_component_pipelines to match the actual signature (tuple[networkx.MultiDiGraph, dict[str, str]]):

• removes the non-existent middle return value (the "boolean indicating" dictionary),
• fixes the description of the second value (a dict[str, str] mapping component names to their SuperComponent name),
• fixes a small "all it's" -> "all its" typo.

Docs-only change, no behavior or tests affected (per the maintainer's note in the issue).

Disclosure: I used AI tools to help draft this change.

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[anakin87]

Thank you!

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Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
haystack/components/builders
chat_prompt_builder.py
haystack/components/joiners
branch.py
haystack/components/preprocessors
document_splitter.py
embedding_based_document_splitter.py
markdown_header_splitter.py
recursive_splitter.py
haystack/components/rankers
meta_field_grouping_ranker.py
haystack/components/routers
conditional_router.py
haystack/core/pipeline
base.py					1799
haystack/document_stores/in_memory
document_store.py
haystack/utils
misc.py
Project Total

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