doc: clarify that __dirname is module local
Pull Request check-list
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Is the commit message formatted according to [CONTRIBUTING.md][0]? -
Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
NOTE: these things are not required to open a PR and can be done afterwards / while the PR is open.
Affected core subsystem(s)
doc
Description of change
Clarify the __dirname is module local.