title: Ignore spelling error in DocX file
body: <p>Using OpenXML, I'm inserting some text into a document that I know will be marked as incorrectly spelled (because it's a product name) and will be marked with the angry red line/squiggly when the file is opened in Word. How can I mark the XML so that it knows that the spelling is correct for that word?</p>
  
  <p>I've tried messing around with <a href="https://msdn.microsoft.com/en-us/library/documentformat.openxml.wordprocessing.prooferror%28v=office.14%29.aspx" rel="nofollow noreferrer">ProofError</a>, putting it in various places with relation to my paragraph and my run and with different values for type, but can't figure out if there's a way to use that to mark something as <em>not</em> an error.</p>