Clarify that steps[*].working-directory applies only to run steps

[kburym]

Fixes #42699

The working-directory section did not say the keyword is only for run steps. The workflow schema in actions/languageservices (workflow-parser/src/workflow-v1.0.json, at fb5c6e4) only allows it on run steps, so this states that and says it is not valid on uses steps, including composite actions.

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Source	Review	Production	What Changed
actions/reference/workflows-and-actions/workflow-syntax.md	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18

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