link check_requirements in index

docs/20_Checks/_index.md

@@ -46,7 +46,7 @@ There is one include script used by all checks:
 * [check_psqlserver](check_psqlserver.md)
 * [check_rearbackup](check_rearbackup.md)
 * [check_reboot_required](check_reboot_required.md)
-* check_requirements
+* [check_requirements](check_requirements.md)
 * check_sensuplugins
 * check_smartstatus
 * [check_snmp_data](check_snmp_data.md)