docs(docs): fix image in "Run graph nodes in parallel" section of N Graph API how-to (#5527)

**Description:**
Replaced the outdated image in the "Run graph nodes in parallel" section
of the N Graph API how-to guide to correctly show parallel node
execution.

**Twitter handle:** @MichaelLoukeris

Co-authored-by: Lauren Hirata Singh <lauren@langchain.dev>
This commit is contained in:
Michael
2025-07-31 20:02:33 +00:00
committed by GitHub
co-authored by Lauren Hirata Singh
parent b3e0582255
commit 94f7f0632d
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