Update an old changelog entry to point at the correct PR.

Author: nirvdrum

CHANGELOG.md

@@ -84,7 +84,7 @@ Performance:
 * Reduce memory footprint by tracking `VALUE`s created during C extension init separately (@aardvark179).
 * Rewrote `ArrayEachIteratorNode` to optimize performance for a constant-sized array and reduce specializations to 1 general case (#2587, @MattAlp)
 * Reduce conversion of `VALUE`s to native handle during common operations in C extensions (@aardvark179).
-* Improved performance of regex boolean matches (e.g., `Regexp#match?`) by avoiding match data allocation in TRegex (#2558, @nirvdrum).
+* Improved performance of regex boolean matches (e.g., `Regexp#match?`) by avoiding match data allocation in TRegex (#2588, @nirvdrum).
 * Remove overhead when getting using `RDATA_PTR` (@aardvark179).
 * Additional copy operations have been reduced when performing IO (#2536, @aardvark179).