Using $this when not in object context in error_reporting_help()

Hi @sarathkm,

I have fixed this issue "Using $this when not in object context in error_reporting_help()" and also attached patch ,
please review and verify.

Already Fixed in the following commit will deploy in the new Release.
https://git.drupalcode.org/project/error_reporting/-/commit/b9fb381835b4...