docs for check_cron: fix requirements

docs/20_Checks/check_cronstatus.md

@@ -17,7 +17,7 @@ As output you get a summary of all checks followed by more detailed status per j
 
 * The cronwrapper must be installed
 * Your cronjob(s) must be changed to use the wrapper, eg.\
- `*/60 * * * * /opt/cronwrappre.sh 60 <YOUR_COMMAND>`
+ `*/60 * * * * /opt/cronwrapper/cronwrapper.sh 60 <YOUR_COMMAND>`
 
 📄 Source: <https://github.com/axelhahn/cronwrapper>\
 📜 License: GNU GPL 3.0\