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What?

Fix a broken link in the ISR guide by switching to a site-absolute
/docs/... URL for the res.revalidate reference.

Why?

Without the leading /, the link can resolve as a relative path and break
depending on where it’s rendered.

How?

Update the ISR guide link target to a site-absolute
/docs/pages/guides/incremental-static-regeneration#on-demand-validation-with-resrevalidate.

Closes NEXT-
Fixes #
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