What do you mean by "Keyword Highlighting"? Its not a term that exists in Geany or Vscode (the other IDE I use ATM), is it the same as syntax highlighting? Is it a notebook++ special feature? If so please describe it. There is a menu shown in the OP which talks about styling keywords, but what does it actually do when you use that menu?
The reference to windows was to point out that few Geany contributors use Windows, and only those might know of a notebook++ feature, or be able to start notebook++ to investigate it, since it is Windows only. Since few people will already know the feature or be able to try the feature it makes it important to describe it, not just name it.