Fix typos in comments

Co-authored-by: David Horstmann <david.horstmann@arm.com>
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/library/ssl_misc.h b/library/ssl_misc.h
index b40f335..cbb1819 100644
--- a/library/ssl_misc.h
+++ b/library/ssl_misc.h
@@ -1686,7 +1686,7 @@
  *              leave NULL for no restartable behaviour.
  *
  * Return:
- * - 0 if the certificate is the handshake should continue. Depending on the
+ * - 0 if the handshake should continue. Depending on the
  *   authmode it means:
  *   - REQUIRED: the certificate was found to be valid, trusted & acceptable.
  *     ssl->session_negotiate->verify_result is 0.