(maint) Add note to update the pdk-templates lint whenever it is change here

In order to ensure that our lint testing remains in step we must keep these two files in sync with eachother:
- https://github.com/puppetlabs/puppetlabs_spec_helper/blob/main/lib/puppetlabs_spec_helper/rake_tasks.rb#L124
- https://github.com/puppetlabs/pdk-templates/blob/d9e6478ff7730a8ce072ce0c1d36a9b79f05ba2c/config_defaults.yml#L69

Author: david22swan

lib/puppetlabs_spec_helper/rake_tasks.rb

@@ -121,6 +121,8 @@
   end
 end
 
+# Ensure that any changes to lint here are reflected within the config_defaults.yml file inside the pdk-templates:
+# - https://github.com/puppetlabs/pdk-templates/blob/d9e6478ff7730a8ce072ce0c1d36a9b79f05ba2c/config_defaults.yml#L69
 require 'puppet-lint/tasks/puppet-lint'
 # Must clear as it will not override the existing puppet-lint rake task since we require to import for
 # the PuppetLint::RakeTask