Update changelogs from fern repo (#6009)

Co-authored-by: jsklan <100491078+jsklan@users.noreply.github.com>

Author: thesandlord

fern/products/cli-api-reference/cli-changelog/2026-06-27.mdx

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+## 5.55.2
+**`(fix):`** Fix `fern docs dev` hot-reload for pages referenced outside the fern/ directory.
+Previously, only changes to files inside the fern/ folder triggered preview refreshes.
+Now, external directories containing referenced docs pages are also watched.
+
+