[libadwaita/wip/exalm/selection-mode-checks: 3/5] doc: Mention content-view and related colors in migration guide

[Alexander Mikhaylenko <alexm src gnome org>]

commit fb9831fc0e6d77eba11be74d3082ed9c73f4b82e
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Wed Dec 1 17:36:18 2021 +0500

    doc: Mention content-view and related colors in migration guide
    
    Oops.

 doc/migrating-libhandy-1-4-to-libadwaita.md | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/doc/migrating-libhandy-1-4-to-libadwaita.md b/doc/migrating-libhandy-1-4-to-libadwaita.md
index d1fa4606..c6105483 100644
--- a/doc/migrating-libhandy-1-4-to-libadwaita.md
+++ b/doc/migrating-libhandy-1-4-to-libadwaita.md
@@ -46,6 +46,8 @@ copy it in tree instead.
 The following named colors have been removed from the stylesheet in
 Libadwaita:
 
+* `@content_view_bg`
+* `@text_view_bg`
 * `@wm_title`
 * `@wm_unfocused_title`
 * `@wm_highlight`
@@ -408,6 +410,11 @@ items inside while doing it.
 The `.list-button` style class has been removed with no replacement. The regular
 button style should be used instead.
 
+### Adapt to the `content-view` style removal
+
+The `.content-view` style class doesn't change background color anymore. The
+default background should be used instead.
+
 #### Adapt to Header Bar, Action Bar, Search Bar and Toolbar Style Changes
 
 When possible, buttons in [class@Gtk.HeaderBar], [class@Gtk.ActionBar] and