PEP 12: SVG is allowed after PEP 676 (#4741)

Co-authored-by: Adam Turner <[email protected]>

Author: hugovk

peps/pep-0012.rst

@@ -599,10 +599,10 @@ processed output using the ``image`` directive:
 
     .. image:: diagram.png
 
-Any browser-friendly graphics format is possible; PNG should be
+Any browser-friendly graphics format is possible; SVG or PNG are
 preferred for graphics, JPEG for photos and GIF for animations.
-Currently, SVG must be avoided due to compatibility issues with the
-PEP build system.
+Images should be optimised to reduce their file size, and should
+be legible in both light and dark mode in the browser.
 
 For accessibility and readers of the source text, you should include
 a description of the image and any key information contained within