Fix link in API fuzzing config helper
What does this MR do and why?
As per the related issue, our new rubocop check for broken links has found a bunch that need to be fixed. This MR fixes links in:
ee/app/helpers/projects/security/api_fuzzing_configuration_helper.rbee/spec/helpers/ee/projects/security/api_fuzzing_configuration_helper_spec.rb
Related to #500232 (closed)
Edited by Russell Dickenson