Improve wording, punctuation, etc.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/ChangeLog.d/fix_zeroization.txt b/ChangeLog.d/fix_zeroization.txt
index ad74d9c..8b00dcc 100644
--- a/ChangeLog.d/fix_zeroization.txt
+++ b/ChangeLog.d/fix_zeroization.txt
@@ -1,3 +1,3 @@
 Bugfix
-   * Fix possible crash in TLS PRF code, if a failure to allocate memory occurs.
-     Reported by Michael Madsen in #6516.
+   * Fix a possible null pointer dereference if a memory allocation fails
+     in TLS PRF code. Reported by Michael Madsen in #6516.