Fix some Typos and indents

Reviewed-by: Andy Polyakov <appro@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4108)

ssl/ssl_locl.h

diff --git a/ssl/ssl_locl.h b/ssl/ssl_locl.h
index c78c28f..8b8625d 100644
--- a/ssl/ssl_locl.h
+++ b/ssl/ssl_locl.h
@@ -2364,7 +2364,7 @@
     TICKET_NO_DECRYPT,
     /* a ticket was successfully decrypted */
     TICKET_SUCCESS,
-    /* same as above but the ticket needs to be reneewed */
+    /* same as above but the ticket needs to be renewed */
     TICKET_SUCCESS_RENEW
 } TICKET_RETURN;
 

ssl/statem/extensions.c

diff --git a/ssl/statem/extensions.c b/ssl/statem/extensions.c
index f62b1fe..2268b27 100644
--- a/ssl/statem/extensions.c
+++ b/ssl/statem/extensions.c
@@ -720,7 +720,7 @@
 
     /* Add custom extensions first */
     if ((context & SSL_EXT_CLIENT_HELLO) != 0) {
-        /* On the server side with initiase during ClientHello parsing */
+        /* On the server side with initialise during ClientHello parsing */
         custom_ext_init(&s->cert->custext);
     }
     if (!custom_ext_add(s, context, pkt, x, chainidx, max_version, &tmpal)) {

ssl/statem/extensions_srvr.c

diff --git a/ssl/statem/extensions_srvr.c b/ssl/statem/extensions_srvr.c
index a3c2fbf..a70f53b 100644
--- a/ssl/statem/extensions_srvr.c
+++ b/ssl/statem/extensions_srvr.c
@@ -87,10 +87,9 @@
     }
 
     /*
-     * Although the server_name extension was intended to be
-     * extensible to new name types, RFC 4366 defined the
-     * syntax inextensibly and OpenSSL 1.0.x parses it as
-     * such.
+     * Although the intent was for server_name to be extensible, RFC 4366
+     * was not clear about it; and so OpenSSL among other implementations,
+     * always and only allows a 'host_name' name types.
      * RFC 6066 corrected the mistake but adding new name types
      * is nevertheless no longer feasible, so act as if no other
      * SNI types can exist, to simplify parsing.