docs(changelog): add Markdown escape sequences entry

Added a changelog entry for the escape sequences in Markdown table
cells.

docs/CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## [Unreleased]
+
+### Fixed
+
+- Escape sequences for pipe characters in values of Markdown table cells
+
 ## [0.2.2] - 2026-10-14
 
 ### Fixed