Fix typo

Change-Id: I209c6d62c2e5cfbc6a35da406bc59fc155787ec9
Reviewed-on: https://gerrit.libreoffice.org/47127Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
Tested-by: Julien Nabet <serval2412@yahoo.fr>

svx/source/form/fmshimp.cxx

@@ -3500,7 +3500,7 @@ void FmXFormShell::CreateExternalView_Lock()
 
             m_xExternalDisplayedForm = xForm;
                 // do this before dispatching the "attach" command, as the attach may result in a call to our queryDispatch (for the FormSlots)
-                // whichs needs the m_xExternalDisplayedForm
+                // which needs the m_xExternalDisplayedForm
 
             xAttachDispatch->dispatch(aAttachURL, Sequence< PropertyValue>(&aArg, 1));