Examples: Renamed SMTP MAIL example to match other email examples

docs/examples/Makefile.inc

@@ -4,7 +4,7 @@ check_PROGRAMS = 10-at-a-time anyauthput cookie_interface debug fileupload \
   https multi-app multi-debugcallback multi-double multi-post multi-single \
   persistant post-callback postit2 sepheaders simple simplepost simplessl  \
   sendrecv httpcustomheader certinfo chkspeed ftpgetinfo ftp-wildcard \
-  smtp-multi smtp-send smtp-ssl smtp-tls smtp-vrfy smtp-expn rtsp \
+  smtp-mail smtp-multi smtp-ssl smtp-tls smtp-vrfy smtp-expn rtsp \
   externalsocket resolve progressfunc pop3-retr pop3-list pop3-uidl pop3-dele \
   pop3-top pop3-stat pop3-noop pop3-ssl pop3-tls imap-list imap-fetch \
   imap-store imap-append imap-examine imap-search imap-create imap-delete \

docs/examples/smtp-ssl.c

@@ -24,7 +24,7 @@
 #include <curl/curl.h>
 
 /* This is a simple example showing how to send mail using libcurl's SMTP
- * capabilities. It builds on the smtp-send.c example to add authentication
+ * capabilities. It builds on the smtp-mail.c example to add authentication
  * and, more importantly, transport security to protect the authentication
  * details from being snooped.
  */

docs/examples/smtp-tls.c

@@ -24,7 +24,7 @@
 #include <curl/curl.h>
 
 /* This is a simple example showing how to send mail using libcurl's SMTP
- * capabilities. It builds on the smtp-send.c example to add authentication
+ * capabilities. It builds on the smtp-mail.c example to add authentication
  * and, more importantly, transport security to protect the authentication
  * details from being snooped.
  */