news: Fix typo

Pointed-out-during-review-by: NJán Tomko <jtomko@redhat.com>
Not-fixed-before-pushing-by: NAndrea Bolognani <abologna@redhat.com>

docs/news.xml

@@ -183,7 +183,7 @@
         <description>
           If this step is not performed, when the data length matches the
           chunk size the decryption routines will misinterpret the last byte
-          of data as the padding lenght and fail to decode it correctly.
+          of data as the padding length and fail to decode it correctly.
         </description>
       </change>
     </section>