warn->info: its just a fact

Change-Id: Id3f468cc4bb4f6f0b34bcc8486817c3f9c994020
diff --git a/oox/source/core/xmlfilterbase.cxx b/oox/source/core/xmlfilterbase.cxx
index 99ce23f..fae720f 100644
--- a/oox/source/core/xmlfilterbase.cxx
+++ b/oox/source/core/xmlfilterbase.cxx
@@ -236,7 +236,7 @@ void XmlFilterBase::checkDocumentProperties(const Reference<XDocumentProperties>
    if (!aValue.startsWithIgnoreAsciiCase("12."))
        return;

    SAL_WARN("oox", "a MSO 2007 document");
    SAL_INFO("oox", "a MSO 2007 document");
    mbMSO2007 = true;
}