Update Migration-Guide-4.0-to-4.1.md

docs/CamiTK Versions/Migration Guides/Migration-Guide-4.0-to-4.1.md

@@ -14,7 +14,7 @@ There is mainly three things that _might_ require your attention:
 
 ## Log message
 
-CamiTK 4.1 introduces a [new log system](./CamiTK-log-system), which is more powerful, very flexible and can trace anything on the console as well as in a log file.
+CamiTK 4.1 introduces a [new log system](https://camitk.gricad-pages.univ-grenoble-alpes.fr/Docs/Highlighted%20Features/Log-System/), which is more powerful, very flexible and can trace anything on the console as well as in a log file.
 The log macros were simplified and this is the only change that will require your attention.
 
 ### Before CamiTK 4.1