[release-11.3.8]Docs: Add admonition in PDF export docs about newPDFRendering feature toggle (#106185)

* Docs: Add admonition in PDF export docs about newPDFRendering feature toggle (#106182)

* Docs: Add admonition in PDF export docs about newpdfrendering feature toggle

* adjusting some wording

(cherry picked from commit 9acdb9572e)

* Update docs/sources/dashboards/create-reports/index.md

Co-authored-by: Christopher Moyer <35463610+chri2547@users.noreply.github.com>

---------

Co-authored-by: Christopher Moyer <35463610+chri2547@users.noreply.github.com>

docs/sources/dashboards/create-reports/index.md

@@ -286,6 +286,10 @@ You can generate and save PDF files of any dashboard.
 
 > **Note:** Available in [Grafana Enterprise](ref:grafana-enterprise) version 6.7 and later, and [Grafana Cloud](/docs/grafana-cloud/).
 
+{{< admonition type="tip">}}
+You can enable the `newPDFRendering` [feature toggle](https://grafana.com/docs/grafana/<GRAFANA_VERSION>/setup-grafana/configure-grafana/feature-toggles/), available in public preview, to improve PDF generation performance.
+{{< /admonition >}}
+
 1. In the dashboard that you want to export as PDF, click the **Share** button.
 1. On the PDF tab, select a layout option for the exported dashboard: **Portrait** or **Landscape**.
 1. Click **Save as PDF** to render the dashboard as a PDF file.