tdf#91920 sw page gutter margin: link ODF proposal

Change-Id: I13693057cc899e999dd145c7a29cac16ef1cb23c
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/112675
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Tested-by: Jenkins
diff --git a/schema/libreoffice/OpenDocument-schema-v1.3+libreoffice.rng b/schema/libreoffice/OpenDocument-schema-v1.3+libreoffice.rng
index 89913cb..3898ed2 100644
--- a/schema/libreoffice/OpenDocument-schema-v1.3+libreoffice.rng
+++ b/schema/libreoffice/OpenDocument-schema-v1.3+libreoffice.rng
@@ -2303,7 +2303,7 @@ xmlns:loext="urn:org:documentfoundation:names:experimental:office:xmlns:loext:1.
    </rng:optional>
  </rng:define>

  <!-- TODO: no proposal for loext:margin-gutter="..." -->
  <!-- https://issues.oasis-open.org/browse/OFFICE-4105 -->
  <rng:define name="style-page-layout-properties-attlist" combine="interleave">
    <rng:optional>
      <rng:attribute name="loext:margin-gutter">