updated episode 06

Author: Remi Kazeroni

_episodes/06-preprocessor.md

@@ -114,7 +114,7 @@ In this case, it gives an error. Below you see the last few lines of the error m
 ...
 Error validating data /home/user/esmvaltool_tutorial/recipe_warming_stripes.yml with schema /home/user/mambaforge/envs/esmvaltool_tutorial/lib/python3.10/site-packages/esmvalcore/recipe_schema.yml
 	documentation.authors: Required field missing
-2020-10-08 15:23:11,162 UTC [19451] INFO    If you have a question or need help, please start a new discussion on https://github.com/ESMValGroup/ESMValTool/discussions
+2022-07-29 15:23:11,162 UTC [19451] INFO    If you have a question or need help, please start a new discussion on https://github.com/ESMValGroup/ESMValTool/discussions
 If you suspect this is a bug, please open an issue on https://github.com/ESMValGroup/ESMValTool/issues
 To make it easier to find out what the problem is, please consider attaching the files run/recipe_*.yml and run/main_log_debug.txt from the output directory.
 ```