docs: Mark heading in migration guide

This heading was missing from the index because it was not marked as one
This commit is contained in:
António Fernandes
2021-02-14 15:20:54 +00:00
parent 0222d389ee
commit a810f600bf

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@@ -135,7 +135,7 @@ These functions are not supported in GTK 4. Instead, either use
backend-specific APIs, or render your widgets using
#GtkWidgetClass.snapshot() (once you are using GTK 4).
Stop using GtkButton's image-related API
### Stop using GtkButton's image-related API
The functions and properties related to automatically add a GtkImage
to a GtkButton, and using a GtkSetting to control its visibility, are