Fix typos in files in ssl directory

Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4052)

ssl/s3_lib.c

diff --git a/ssl/s3_lib.c b/ssl/s3_lib.c
index 3e70bce..a2959a3 100644
--- a/ssl/s3_lib.c
+++ b/ssl/s3_lib.c
@@ -3790,7 +3790,7 @@
     SSL_CIPHER *tbl = ssl3_ciphers;
     size_t i;
 
-    /* this is not efficient, necessary to optimze this? */
+    /* this is not efficient, necessary to optimize this? */
     for (i = 0; i < SSL3_NUM_CIPHERS; i++, tbl++) {
         if (tbl->stdname == NULL)
             continue;