Update CHANGELOG

Author: shulhi

CHANGELOG.md

@@ -26,6 +26,7 @@
 - Fix `index out of bounds` exception thrown in rare cases by `rescript-editor-analysis.exe codeAction` command. https://github.com/rescript-lang/rescript/pull/7523
 - Don't produce duplicate type definitions for recursive types on hover. https://github.com/rescript-lang/rescript/pull/7524
 - Prop punning when types don't match results in I/O error: _none_: No such file or directory. https://github.com/rescript-lang/rescript/pull/7533
+- Fix doc comment before variant throwing syntax error. https://github.com/rescript-lang/rescript/pull/7535
 
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