[gedit] docs: document lockdown API break

[SĂŠbastien Wilmet <swilmet src gnome org>]

commit cc39b8e4a5d70ac307bd63f6b0ed485661681084
Author: SĂŠbastien Wilmet <swilmet gnome org>
Date:   Tue Mar 17 13:19:50 2020 +0100

    docs: document lockdown API break

 docs/reference/api-breaks.xml | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
---
diff --git a/docs/reference/api-breaks.xml b/docs/reference/api-breaks.xml
index 6d8c2531d..0b15d9cca 100644
--- a/docs/reference/api-breaks.xml
+++ b/docs/reference/api-breaks.xml
@@ -21,6 +21,26 @@
     <link linkend="api-index-deprecated">index of deprecated symbols</link>.
   </para>
 
+  <refsect1>
+    <title>3.36.0 -> 3.37.1</title>
+    <itemizedlist>
+      <!--
+      <listitem>
+        <para>
+          All previously deprecated APIs have been removed.
+        </para>
+      </listitem>
+      -->
+      <listitem>
+        <para>
+          The lockdown support has been removed (for the
+          org.gnome.desktop.lockdown GSettings). So the
+          <code>gedit_app_get_lockdown()</code> function has been removed.
+        </para>
+      </listitem>
+    </itemizedlist>
+  </refsect1>
+
   <refsect1>
     <title>3.34.0 -> 3.35.2</title>
     <itemizedlist>