chore: update changelog text

Author: DmitryAnansky

.changeset/fuzzy-ducks-exist.md

@@ -3,4 +3,4 @@
 "@redocly/cli": minor
 ---
 
-Extracted `nullable` validation from the `struct` rule into a new `nullable-type-sibling` rule for OpenAPI 3.0. This allows users to disable `nullable` validation separately from other structural checks.
+Extracted `nullable` validation from the `struct` rule into a new `nullable-type-sibling` rule for OpenAPI 3.0. Use this rule to disable `nullable` validation separately from other structural checks.