docs(deferrable): clarify api docs (#13120)

Co-authored-by: Pedro Augusto de Paula Barbosa <papb1996@gmail.com>

lib/deferrable.js

@@ -87,17 +87,19 @@ class SET_IMMEDIATE extends ABSTRACT {
  * });
  * ```
  *
- * @property INITIALLY_DEFERRED Defer constraints checks to the end of transactions.
- * @property INITIALLY_IMMEDIATE Trigger the constraint checks immediately
- * @property NOT Set the constraints to not deferred. This is the default in PostgreSQL and it make it impossible to dynamically defer the constraints within a transaction.
- * @property SET_DEFERRED
- * @property SET_IMMEDIATE
+ * @property INITIALLY_DEFERRED    Use when declaring a constraint. Allow and enable by default this constraint's checks to be deferred at the end of transactions.
+ * @property INITIALLY_IMMEDIATE   Use when declaring a constraint. Allow the constraint's checks to be deferred at the end of transactions.
+ * @property NOT                   Use when declaring a constraint. Set the constraint to not deferred. This is the default in PostgreSQL and makes it impossible to dynamically defer the constraints within a transaction.
+ * @property SET_DEFERRED          Use when declaring a transaction. Defer the deferrable checks involved in this transaction at commit.
+ * @property SET_IMMEDIATE         Use when declaring a transaction. Execute the deferrable checks involved in this transaction immediately.
  */
 
-const Deferrable = module.exports = { // eslint-disable-line
+const Deferrable = {
   INITIALLY_DEFERRED: classToInvokable(INITIALLY_DEFERRED),
   INITIALLY_IMMEDIATE: classToInvokable(INITIALLY_IMMEDIATE),
   NOT: classToInvokable(NOT),
   SET_DEFERRED: classToInvokable(SET_DEFERRED),
   SET_IMMEDIATE: classToInvokable(SET_IMMEDIATE)
 };
+
+module.exports = Deferrable;