Remove CKEDITOR built in SCAYT spellcheck, using default HTML5 spell check

To enable CKEDITOR  for following textarea,
<textarea id="EditManual "></textarea>
To remove CKEDITOR built in SCAYT spellcheck, using default HTML5 spell check
JavaScript code
       CKEDITOR.replace( 'EditManual', {
            removePlugins: 'scayt,wsc',
            disableNativeSpellChecker: false
        });