Adjust changelog entry

Author: daxpedda

Diff for: CHANGELOG.md

@@ -19,7 +19,7 @@
 * Fixed unused string enums generating JS values.
   [#4193](https://github.com/rustwasm/wasm-bindgen/pull/4193)
 
-* Fixed a minor bug with regexes when printing debug information.
+* Fixed potential `null` error when using `JsValue::as_debug_string()`.
   [#4192](https://github.com/rustwasm/wasm-bindgen/pull/4192)
 
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