(tls) add a simple description of the TLS configuration routine for debugging

docs/CHANGELOG.md

@@ -1,6 +1,10 @@
 # Changelog
 All notable changes to this project will be documented in this file.
 
+## [7.6.3] - 2019-12-20
+
+(tls) add a simple description of the TLS configuration routine for debugging
+
 ## [7.6.2] - 2019-12-20
 
 (mbedtls) correct support for using own certificate and private key