docs: Emphasize requirement to give filenames as arguments

(related to #5430)
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andy5995 2022-12-11 03:18:53 -06:00
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@ -1018,6 +1018,10 @@ Our application now looks like this:
In this step, we make our application show the content of all the files
that it is given on the commandline.
**Note: Providing filenames (e.g. `./exampleapp examplewin.c examplewin.h`) at
the command line is a requirement for example apps 3-9 to display as shown in
the screenshots below.**
To this end, we add a member to the struct of our application window subclass
and keep a reference to the `GtkStack` there. The first member of the struct
should be the parent type from which the class is derived. Here,