Add Tool input schema docs and update output parser docs

[OlegIvaniv]

n8n-io/n8n#9470

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[github-actions]

Overall readability score: 43.03 (🟢 +0)

File	Readability
schema-type-structuring.md	47.71 (-)
n8n-nodes-langchain.outputparserstructured.md	7.1 (🔴 -2.73)
n8n-nodes-langchain.toolworkflow.md	33.34 (🔴 -0.57)

View detailed metrics

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

File	Readability	FRE	GF	ARI	CLI	DCRS
schema-type-structuring.md	47.71	37.67	12.12	9.7	12.08	10.36
	-	-	-	-	-	-
n8n-nodes-langchain.outputparserstructured.md	7.1	0	14.86	22	19	11
	🔴 -2.73	🔴 -6.44	🟢 +0.17	🟢 +0	🟢 +0	🔴 -0.61
n8n-nodes-langchain.toolworkflow.md	33.34	29.86	10.23	19	18.15	8.57
	🔴 -0.57	🔴 -1.62	🔴 -0.08	🟢 +0	🟢 +0.34	🔴 -0.2

Averages:

	Readability	FRE	GF	ARI	CLI	DCRS
Average	43.03	36.39	12.03	14.86	13.99	8.63
	🟢 +0	🔴 -0.01	🟢 +0	🟢 +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