docs: added currency documentation pages (#3803)

* docs: added currency documentation pages

* fixes to OAS

packages/medusa/src/api/routes/admin/currencies/update-currency.ts

@@ -32,7 +32,7 @@ import { EntityManager } from "typeorm"
  *         includes_tax: true
  *       })
  *       .then(({ currency }) => {
- *         console.log(currency.id);
+ *         console.log(currency.code);
  *       });
  *   - lang: Shell
  *     label: cURL

packages/medusa/src/api/routes/admin/store/add-currency.ts

@@ -28,7 +28,7 @@ import { EntityManager } from "typeorm"
  *       // must be previously logged in or use api token
  *       medusa.admin.store.addCurrency('eur')
  *       .then(({ store }) => {
- *         console.log(store.id);
+ *         console.log(store.currencies);
  *       });
  *   - lang: Shell
  *     label: cURL

packages/medusa/src/api/routes/admin/store/remove-currency.ts

@@ -28,7 +28,7 @@ import { EntityManager } from "typeorm"
  *       // must be previously logged in or use api token
  *       medusa.admin.store.deleteCurrency('eur')
  *       .then(({ store }) => {
- *         console.log(store.id);
+ *         console.log(store.currencies);
  *       });
  *   - lang: Shell
  *     label: cURL