Documentation: Add v2.20.13 changelog (#12408)

* Changelog v2.20.13 - GHA

* Update changelog for version 2.20.13

Added bug fixes for version 2.20.13 in changelog.

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Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>

docs/changelog.md

@@ -1,5 +1,14 @@
 # Changelog
 
+## paperless-ngx 2.20.13
+
+### Bug Fixes
+
+-   Fix: suggest corrections only if visible results
+-   Fix: require view permission for more-like search
+-   Fix: validate document link targets
+-   Fix: enforce permissions when attaching accounts to mail rules
+
 ## paperless-ngx 2.20.12
 
 ### Security