doc: document deprecated page-specific editor overrides

Signed-off-by: James Knight <git@jdknight.me>

Author: jdknight

doc/_themes/sphinx13b/static/sphinx13b.css

@@ -438,6 +438,10 @@ div.viewcode-block:target {
     border-bottom: 1px solid #ac9;
 }
 
+span.deprecated {
+    font-weight: bold;
+}
+
 .contentstable {
     margin-left: 30px;
     margin: 0 auto;

doc/directives.rst

@@ -214,6 +214,11 @@ Common
     .. rst:directive:option:: editor: value
         :type: v1, v2
 
+        .. deprecated:: 2.14
+
+            Support for page-specific editor overrides will be removed in 2026
+            as Confluence Cloud removes support for the ``v1`` editor.
+
         Pages are publish with the editor type configured through the
         :lref:`confluence_editor` option. However, users can override the
         editor for a specific page using the ``editor`` metadata option.