code: function cleanHeadings( el ) {
  		var i;
  		for ( i = 0; i < el.length; i++ ) {
  			el[ i ].innerHTML = cleanHeading( el[ i ].innerHTML );
  		}
  	}
docs: Cleans up heading text.
  
  @private
  @param {Array<DOMElement>} el - list of heading elements to clean