docs(template): add JSDoc to js migration template (#1068)

Co-authored-by: Shinigami92 <[email protected]>

Author: codermarcos

templates/migration-template.js

@@ -1,5 +1,18 @@
+/**
+ * @type {import('node-pg-migrate').ColumnDefinitions | undefined}
+ */
 exports.shorthands = undefined;
 
+/**
+ * @param pgm {import('node-pg-migrate').MigrationBuilder}
+ * @param run {() => void | undefined}
+ * @returns {Promise<void> | void}
+ */
 exports.up = (pgm) => {};
 
+/**
+ * @param pgm {import('node-pg-migrate').MigrationBuilder}
+ * @param run {() => void | undefined}
+ * @returns {Promise<void> | void}
+ */
 exports.down = (pgm) => {};