core: use https for WeeChat URLs

src/plugins/exec/exec-command.c

@@ -865,7 +865,7 @@ exec_command_init ()
            "  /exec -n ps xu | grep weechat\n"
            "  /exec -n -norc url:http://pastebin.com/raw.php?i=xxxxxxxx\n"
            "  /exec -nf -noln links -dump "
-           "http://weechat.org/files/doc/devel/weechat_user.en.html\n"
+           "https://weechat.org/files/doc/devel/weechat_user.en.html\n"
            "  /exec -o uptime\n"
            "  /exec -pipe \"/print Machine uptime:\" uptime\n"
            "  /exec -n tail -f /var/log/messages\n"

src/plugins/irc/irc-ctcp.c

@@ -421,7 +421,7 @@ irc_ctcp_replace_variables (struct t_irc_server *server, const char *format)
 
     /*
      * $site: WeeChat web site, example:
-     *   http://weechat.org/
+     *   https://weechat.org/
      */
     info = weechat_info_get ("weechat_site", "");
     temp = weechat_string_replace (res, "$site", info);
@@ -432,7 +432,7 @@ irc_ctcp_replace_variables (struct t_irc_server *server, const char *format)
 
     /*
      * $download: WeeChat download page, example:
-     *   http://weechat.org/download
+     *   https://weechat.org/download
      */
     info = weechat_info_get ("weechat_site_download", "");
     temp = weechat_string_replace (res, "$download", info);

src/plugins/relay/relay-command.c

@@ -383,7 +383,7 @@ relay_command_init ()
            "The \"irc\" protocol allows any IRC client (including WeeChat "
            "itself) to connect on the port.\n"
            "The \"weechat\" protocol allows a remote interface to connect on "
-           "the port, see the list here: http://weechat.org/download/\n"
+           "the port, see the list here: https://weechat.org/download/\n"
            "\n"
            "Without argument, this command opens buffer with list of relay "
            "clients.\n"