Improve handler shape validation guidance #281

Job	Run time
docs-pr	8s
Lint & Test	6m 52s
PDF Visual Regression	6m 30s
Build Docker Image	8m 30s
Build & Test (linux-kvm-release)	6m 30s
Build & Test (linux-mshv-release)	7m 0s
Build & Test (windows-whp-release)	7m 24s
Build & Test (linux-kvm-debug)	5m 48s
Build & Test (linux-mshv-debug)	7m 26s
Build & Test (windows-whp-debug)	7m 10s
CI Status	2s
	1h 3m 20s

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