Helptext manipulation - with or without DOM manipulation (classic UI)

Remove helptext from a field without DOM manipulation:

var worknotes = g_form.getLabel('work_notes_list');

worknotes.removeChild(worknotes.lastElementChild);

another option

function removeHintFromLabel(fieldName) {
  var oField = g_form.getLabel(fieldName);
  var fieldChildren = oField.childNodes;
 
  for (var c = 0; c < fieldChildren.length; c++) {
    var className = fieldChildren[c].className;
    if (className.indexOf('icon-help') != -1) {
      oField.removeChild(fieldChildren[c]);
    }
  }
}
 
removeHintFromLabel('work_notes_list');

with DOM - note: old article, not necessarily the best to use DOM

https://servicenowguru.com/scripting/client-scripts-scripting/showhide-service-catalog-variable-help-text/