Replace example with generic content

Author: jamesps-ebi

REFERENCE.md

@@ -1198,7 +1198,7 @@ apt::source_deb822 { 'Puppetlabs-puppet':
   uris       => ['http://apt.puppet.com'],
   suites     => ['jammy'],
   components => ['puppet8'],
-  signed_by  => ['/etc/apt/keyrings/linuxembl-ebi.gpg'],
+  signed_by  => ['/etc/apt/keyrings/puppetlabs.gpg'],
 }
 ```
 

manifests/source_deb822.pp

@@ -8,7 +8,7 @@
 #     uris       => ['http://apt.puppet.com'],
 #     suites     => ['jammy'],
 #     components => ['puppet8'],
-#     signed_by  => ['/etc/apt/keyrings/linuxembl-ebi.gpg'],
+#     signed_by  => ['/etc/apt/keyrings/puppetlabs.gpg'],
 #   }
 #
 # @example Ensure absence of a repo