Update CHANGELOG

Author: shulhi

CHANGELOG.md

@@ -37,6 +37,7 @@
 - Improve error message for pipe (`->`) syntax. https://github.com/rescript-lang/rescript/pull/7520
 - Improve a few error messages around various subtyping issues. https://github.com/rescript-lang/rescript/pull/7404
 - In module declarations, accept the invalid syntax `M = {...}` and format it to `M : {...}`. https://github.com/rescript-lang/rescript/pull/7527
+- Improve doc comment formatting to match the style of multiline comments. https://github.com/rescript-lang/rescript/pull/7529
 
 #### :house: Internal
 

Example.res

@@ -0,0 +1,8 @@
+type rec expression =
+  | /** non-negative integer constant */ Numeral(float)
+  | /** Addition [e1 + e2] */ Plus(expression, expression)
+
+/** doc comment */
+
+// comment
+let a = 1