Philip Withnall 82abb80553 docs: Update interfaces in GObject how-to examples
Use G_DECLARE_INTERFACE and G_DEFINE_INTERFACE. Fix a couple of typos.
Add some comments to empty functions to make it obvious they’re
intentionally empty.

https://bugzilla.gnome.org/show_bug.cgi?id=744060
2015-08-21 15:15:52 +01:00
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