resize h3 with HR line above

function resizeH3AndAddHorizontalLine() {
  // Get the active document
  var doc = DocumentApp.openById(DOCID);
  var body = doc.getBody();
  
  // Get all the paragraphs in the document
  var paragraphs = body.getParagraphs();
  
  // Loop from the last paragraph to the first
  for (var i = paragraphs.length - 1; i >= 0; i--) {
    var paragraph = paragraphs[i];
    
    // Check if the paragraph is an H3
    if (paragraph.getHeading() === DocumentApp.ParagraphHeading.HEADING3) {
      // Resize the H3 element
      paragraph.setFontSize(16);  // Set the desired font size
      
      // Add a horizontal line above the H3 element
      body.insertHorizontalRule(i);
    }
  }
}