[doc] Liniting

Author: grindsa

CHANGES.md

@@ -5,9 +5,9 @@ This is a high-level summary of the most important changes. For a full list of
 changes, see the [git commit log](https://github.com/grindsa/acme2certifier/commits)
 and pick the appropriate release branch.
 
-# Change in 0.23
+# Changes in 0.23
 
-**Features and Improvements**
+**Features and Improvements**:
 
 - Healthcheck in directory ressource [#94](https://github.com/grindsa/acme2certifier/issues/94)
 - check `acme_srv.cfg` for options starting with "