Added note on YAML tags

Author: Kalle Fagerberg

src/content/docs/reference/config.mdx

@@ -6,6 +6,11 @@ description: Configuration file reference
 In addition to environment variables, you can configure kubecolor via
 a dedicated config file: `~/.kube/color.yaml`
 
+The "[`!color`](/reference/types/color)" & "[`!color-list`](/reference/types/color-list)"
+YAML tags are only included here in the documentation to signal what data type
+is used.
+The tags should not be present in your config file.
+
 Example file (the values shows the default values):
 
 ```yaml