Add a man page for mytop that is in sources

Related to MDEV-21769.

man/CMakeLists.txt

@@ -32,7 +32,7 @@ SET(MAN1_SERVER innochecksum.1 my_print_defaults.1 myisam_ftdump.1 myisamchk.1
 SET(MAN8_SERVER mysqld.8)
 SET(MAN1_CLIENT msql2mysql.1 mysql.1 mysql_find_rows.1 mysql_waitpid.1
 		mysqlaccess.1 mysqladmin.1 mysqlbinlog.1 mysqlcheck.1
-		mysqldump.1 mysqlimport.1 mysqlshow.1 mysqlslap.1
+		mysqldump.1 mysqlimport.1 mysqlshow.1 mysqlslap.1 mytop.1
                 mysql_plugin.1 mysql_embedded.1)
 SET(MAN1_DEVEL mysql_config.1)
 SET(MAN1_TEST mysql-stress-test.pl.1 mysql-test-run.pl.1 mysql_client_test.1

man/mytop.1

+.TH MYTOP "1" "March 2020" "MariaDB 10\&.5" "MariaDB Database System"
+.SH NAME
+mytop \- display MariaDB server performance info like 'top'
+.SH "SEE ALSO"
+For more information, please refer to the MariaDB Knowledge Base, available online at https://mariadb.com/kb/
+.SH AUTHOR
+MariaDB Foundation (http://www.mariadb.org/).