Updated security descriptions

Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>

Author: radarhere

docs/releasenotes/9.4.0.rst

@@ -78,14 +78,14 @@ Fix memory DOS in ImageFont
 A corrupt or specially crafted TTF font could have font metrics that lead to
 unreasonably large sizes when rendering text in font. ``ImageFont.py`` did not
 check the image size before allocating memory for it. This dates to the PIL
-fork. Pilllow 8.2.0 added a check for large sizes, but did not consider the
-case where one dimension was zero.
+fork. Pillow 8.2.0 added a check for large sizes, but did not consider the
+case where one dimension is zero.
 
 Null pointer dereference crash in ImageFont
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 Pillow attempted to dereference a null pointer in ``ImageFont``, leading to a
-crash. An error is now raised instead. This would have been present since
+crash. An error is now raised instead. This has been present since
 Pillow 8.0.0.
 
 Other Changes