Fix typo

Change-Id: I7341d932b4d88cfd540056ff292b8ad003af6830
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/87779
Tested-by: Jenkins
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>

include/xmloff/xmlexp.hxx

@@ -180,7 +180,7 @@ protected:
     // Get (modifiable) namespace map
     SvXMLNamespaceMap& GetNamespaceMap_() { return *mpNamespaceMap; }
 
-    // get a new namespave map (used in starmath to have a default namespace)
+    // get a new namespace map (used in starmath to have a default namespace)
     void ResetNamespaceMap();
 
     /// Override this method to export the content of <office:meta>.