fix parameter documentation

Author: h0tw1r3

manifests/database/read_only_user.pp

@@ -4,11 +4,14 @@
 # the default access privileges so read-only access is maintained when
 # new objects are created by the $database_owner
 #
-# @param database_read_only_username [String] The name of the postgres read only user.
-# @param database [String] The name of the database to grant access to.
-# @param database_owner [String] The user which owns the database (i.e. the migration user
-#        for the database).
-# @param password_hash [String] The value of $_database_password in app_database.
+# @param read_database_username
+#   The name of the postgres read only user.
+# @param database_name
+#   The name of the database to grant access to.
+# @param database_owner
+#   The user which owns the database (i.e. the migration user for the database).
+# @param password_hash
+#   The value of $_database_password in app_database.
 #
 # @api private
 define puppetdb::database::read_only_user (