Typo in changelog regarding version 9.2.1 (#5110)

Co-authored-by: fnberger <f.berger@mid.de>

Author: BambiMC

docs/guides/references/changelog.mdx

@@ -2641,7 +2641,7 @@ _Released 1/18/2022_
 - Upgraded `electron` from `15.2.0` to `15.3.4`. Addressed in
   [#19351](https://github.com/cypress-io/cypress/issues/19351).
 
-# 9.2.1
+## 9.2.1
 
 _Released 1/10/2022_