Minor: Fix typo in program comments

Fix a typo in some reference program applications
diff --git a/programs/ssl/ssl_server2.c b/programs/ssl/ssl_server2.c
index 73029e2..2c5d9eb 100644
--- a/programs/ssl/ssl_server2.c
+++ b/programs/ssl/ssl_server2.c
@@ -1709,7 +1709,7 @@
 
 #if defined(POLARSSL_X509_CRT_PARSE_C)
     /*
-     * 5. Verify the server certificate
+     * 5. Verify the client certificate
      */
     polarssl_printf( "  . Verifying peer X.509 certificate..." );