Update docs/handbook/security.rst

Co-authored-by: Andrew Murray <3112309+radarhere@users.noreply.github.com>

Author: aclark4life

docs/handbook/security.rst

@@ -190,6 +190,7 @@ provide a stable public API for unregistering individual format plugins, so do
 not rely on mutating internal registries such as ``Image.OPEN`` as a security
 control.
 
+
 **E-3 — ``ImageMath.unsafe_eval()`` code injection**
 
 :py:meth:`~PIL.ImageMath.unsafe_eval` calls Python's built-in ``eval()`` with