fix(docs): add editURL.enable = true (imfing#245)

The MR documents the requirement to enable editURL setting.


[A  prior commit](imfing@04a5c73#diff-5311bf4e1519696010f8298385d9de30210dfcd9dee8785f6deba3a084b62eecL26) the behavior changed from a default of "disable = false" to a default of "enabled = false".

exampleSite/content/docs/guide/configuration.md

@@ -139,6 +139,7 @@ To configure the page edit link, we can set the `params.editURL.base` parameter
 ```yaml {filename="hugo.yaml"}
 params:
  editURL:
+ enable: true
  base: "https://github.com/your-username/your-repo/edit/main"
 ```