docs: fix preview port in DOCS_GUIDELINES example #12060

Job	Run time
Semantic PR title	3s
Format	45s
File size check	13s
Detect changes	17s
Typecheck	0s
GCP BeginFrame image contract	0s
Test: skills	0s
Fallow audit	0s
Test	0s
Studio: load smoke	0s
CLI: npx shim (${{ matrix.os }})	-1s
Lint	-1s
Producer: ${{ matrix.lane }} tests	-1s
Codex plugin package	-1s
CLI smoke (required)	-1s
Skills: manifest in sync	-1s
Build	-1s
Skills: project-native lint + mirror	-1s
SDK: unit + contract + smoke	-1s
Test: runtime contract	-1s
Smoke: global install	-1s
	1m 7s

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