[libadwaita/wip/exalm/fixes: 1/2] doc: Fix an inaccuracy in style docs

[Alexander Mikhaylenko <alexm src gnome org>]

commit 3d033f2f4985e7163648919226483faa3f9f07df
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Fri Dec 17 19:11:15 2021 +0500

    doc: Fix an inaccuracy in style docs

 doc/migrating-between-development-versions.md | 5 +++--
 doc/migrating-libhandy-1-4-to-libadwaita.md   | 5 +++--
 doc/style-classes.md                          | 5 +++--
 3 files changed, 9 insertions(+), 6 deletions(-)
---
diff --git a/doc/migrating-between-development-versions.md b/doc/migrating-between-development-versions.md
index 76838946..c9118e7f 100644
--- a/doc/migrating-between-development-versions.md
+++ b/doc/migrating-between-development-versions.md
@@ -129,8 +129,9 @@ The following buttons keep default appearance:
 * Buttons with other content;
 * Buttons within widgets containing the
   [`.linked`](style-classes.html#linked-controls) class;
-* Buttons with the [`.suggested-action`](style-classes.html#suggested-action) or
-  [`.destructive-action`](style-classes.html#destructive-action) style classes.
+* Buttons with the [`.suggested-action`](style-classes.html#suggested-action),
+  [`.destructive-action`](style-classes.html#destructive-action) or
+  [`.opaque`](style-classes.html#opaque) style classes.
 * Buttons with the [`.raised`](style-classes.html#raised) style class.
 
 It's important to avoid ambiguous layouts, for example text-only buttons with
diff --git a/doc/migrating-libhandy-1-4-to-libadwaita.md b/doc/migrating-libhandy-1-4-to-libadwaita.md
index fc8de705..d008b61c 100644
--- a/doc/migrating-libhandy-1-4-to-libadwaita.md
+++ b/doc/migrating-libhandy-1-4-to-libadwaita.md
@@ -449,8 +449,9 @@ The following buttons keep default appearance:
 * Buttons with other content;
 * Buttons within widgets containing the
   [`.linked`](style-classes.html#linked-controls) class;
-* Buttons with the [`.suggested-action`](style-classes.html#suggested-action) or
-  [`.destructive-action`](style-classes.html#destructive-action) style classes.
+* Buttons with the [`.suggested-action`](style-classes.html#suggested-action),
+  [`.destructive-action`](style-classes.html#destructive-action) or
+  [`.opaque`](style-classes.html#opaque) style classes.
 * Buttons with the [`.raised`](style-classes.html#raised) style class.
 
 It's important to avoid ambiguous layouts, for example text-only buttons with
diff --git a/doc/style-classes.md b/doc/style-classes.md
index 8ac2237a..c1cb7a51 100644
--- a/doc/style-classes.md
+++ b/doc/style-classes.md
@@ -214,8 +214,9 @@ The following buttons keep default appearance:
 * Buttons with other content;
 * Buttons within widgets with the [`.linked`](#linked-controls) style
   class;
-* Buttons with the [`.suggested-action`](#suggested-action) or
-  [`.destructive-action`](#destructive-action) style classes.
+* Buttons with the [`.suggested-action`](#suggested-action),
+  [`.destructive-action`](#destructive-action) or [`.opaque`](#opaque) style
+  classes.
 * Buttons with the [`.raised`](#raised) style class.
 
 It also ensures 6px margins and spacing between widgets. The