Incorrect documentation for KRecentFilesAction::saveEntries

[George Florea Banus]

The documentation for KRecentFilesAction::saveEntries says "You can 
provide the name of the group used to load the entries. If the groupname 
is empty, entries are saved to a group called 'RecentFiles'".

And in the code it checks if name is empty `(cg.name().isEmpty()) { ... 
}`, but `cg.name()` is never empty [link1] resulting in the files being 
saved without a group, it was like this since the method was added [link2].

I wanted to submit a MR to kconfigwidgets also checking if the name is 
<default>, but since it's been like this from the beginning, it might be 
better to change the documentation for KRecentFilesAction::saveEntries. 
----------------

link1: 
https://invent.kde.org/frameworks/kconfig/-/blob/e40531e29e2ff52d67156aa8ae7691488ca1c29b/src/core/kconfiggroup.cpp#L98

link2: 
https://github.com/KDE/kdelibs/commit/9cb1bcace61a1e96c21b92185f41ed2a396fbdd8#diff-8e9f49b617fa7af49d38cb3ac5d5a071ce7090fd832365c00106ec584283e762R91
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