chore: add link to Wiki in default config

Author: ankddev

assets/default_config.toml

@@ -1,5 +1,5 @@
 # Config for envfetch. See for documentation in our documentation.
-# https://github.com/ankddev/envfetch
+# https://github.com/ankddev/envfetch/wiki/4.-Configuration
 
 # Custom format for list of variables. {name} is replaced with variable's name and {value} is replaced with it's value
 # print_format = "{name} = {value}"