Fix some out of date comments

Fix various references to s3_clnt.c and s3_srvr.c which don't exist
any more.

GitHub Issue #765

Reviewed-by: Richard Levitte <levitte@openssl.org>
diff --git a/ssl/statem/statem_clnt.c b/ssl/statem/statem_clnt.c
index 8da3e9b..05651d5 100644
--- a/ssl/statem/statem_clnt.c
+++ b/ssl/statem/statem_clnt.c
@@ -1352,7 +1352,7 @@
     s->session->peer_chain = sk;
     /*
      * Inconsistency alert: cert_chain does include the peer's certificate,
-     * which we don't include in s3_srvr.c
+     * which we don't include in statem_srvr.c
      */
     x = sk_X509_value(sk, 0);
     sk = NULL;