Add a comment referencing where this Enum is defined

Author: figless

lib/puppet/functions/postgresql/postgresql_password.rb

@@ -24,6 +24,8 @@
     required_param 'Variant[String[1], Integer]', :username
     required_param 'Variant[String[1], Sensitive[String[1]], Integer]', :password
     optional_param 'Boolean', :sensitive
+    # Note that this Enum is also defined in:
+    # types/pg_password_encryption.pp
     optional_param 'Optional[Enum["md5", "scram-sha-256"]]', :hash
     optional_param 'Optional[Variant[String[1], Integer]]', :salt
     return_type 'Variant[String, Sensitive[String]]'

types/pg_password_encryption.pp

@@ -1,2 +1,4 @@
 # @summary the supported password_encryption
+# Note that this Enum is also defined in:
+# lib/puppet/functions/postgresql/postgresql_password.rb
 type Postgresql::Pg_password_encryption = Enum['md5', 'scram-sha-256']