docs: Add documentation for update operations in vector store nodes

[burivuhster]

PR: n8n-io/n8n#10060
Ticket in Linear: https://linear.app/n8n/issue/AI-202/add-update-operations-to-vector-store-nodes

Support for the Update operation was added to Pinecone and Supabase Vector Store nodes. It allows to update a specific item in vector store by its ID.

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[github-actions]

Overall readability score: 42.31 (🟢 +0.02)

File	Readability
common-vector-store-modes.md	67.87 (-)
vector-store-mode.md	24.25 (🔴 -44.82)
n8n-nodes-langchain.vectorstorepinecone.md	15.03 (🟢 +8.83)
n8n-nodes-langchain.vectorstoresupabase.md	24.16 (🟢 +7.82)

View detailed metrics

🟢 - Shows an increase in readability
🔴 - Shows a decrease in readability

File	Readability	FRE	GF	ARI	CLI	DCRS
common-vector-store-modes.md	67.87	54.52	10.1	9.9	10.21	6.76
	-	-	-	-	-	-
vector-store-mode.md	24.25	25.15	10.33	18.4	19	11
	🔴 -44.82	🔴 -30.9	🔴 -0.83	🔴 -9	🔴 -8.74	🔴 -4.01
n8n-nodes-langchain.vectorstorepinecone.md	15.03	7.15	14.39	22	19	9.15
	🟢 +8.83	🟢 +7.15	🟢 +3.13	🟢 +0	🟢 +0	🟢 +0.71
n8n-nodes-langchain.vectorstoresupabase.md	24.16	12.33	11.45	21.3	19	8.46
	🟢 +7.82	🟢 +12.33	🟢 +1.69	🟢 +0.7	🟢 +0	🟢 +0.58

Averages:

	Readability	FRE	GF	ARI	CLI	DCRS
Average	42.31	34.25	11.79	15.02	14.44	8.6
	🟢 +0.02	🟢 +0.02	🟢 +0.01	🟢 +0	🟢 +0	🟢 +0

View metric targets

Metric	Range	Ideal score
Flesch Reading Ease	100 (very easy read) to 0 (extremely difficult read)	60
Gunning Fog	6 (very easy read) to 17 (extremely difficult read)	8 or less
Auto. Read. Index	6 (very easy read) to 14 (extremely difficult read)	8 or less
Coleman Liau Index	6 (very easy read) to 17 (extremely difficult read)	8 or less
Dale-Chall Readability	4.9 (very easy read) to 9.9 (extremely difficult read)	6.9 or less

[burivuhster]

n8n-io/n8n#10060

Not all vector store nodes will support update operation. For now only Pinecone and Supabase does support it.