title: What is the API way to edit a 'floating' row in Ag-Grid
body: <p>There is below api to edit a rowIndex.  But what is the API to edit a floatingTopRow or floatingBottomRow in ag-grid.  I use ag-grid-enterprise evaluation.</p>
  
  <pre><code>this.gridOptions.api.startEditingCell({
    rowIndex: 10, colKey:'column_name'
  });
  </code></pre>
  
  <p>thanks in advance.</p>