Add a new subtitle

Author: cderv

docs/output-formats/pdf-basics.qmd

@@ -216,6 +216,8 @@ With fonts with appropriate support, Greek symbols render correctly in headings,
 
 ## SVG Images {#svg-images}
 
+### Using `rsvg-convert` to convert to PDF
+
 Quarto supports rendering of PDF documents that include SVG files, automatically converting them to PDF images if `rsvg-convert` is available on the system path during rendering.
 
 You can learn more about installing `librsvg`{spellcheck="false"} (which provides `rsvg-convert`{spellcheck="false"}), see <https://wiki.gnome.org/Projects/LibRsvg>. To install on specific platforms: