Code cleanup and documentation improvements.

app/Api/V1/Requests/CurrencyRequest.php

@@ -30,6 +30,8 @@ namespace FireflyIII\Api\V1\Requests;
 class CurrencyRequest extends Request
 {
     /**
+     * Authorize logged in users.
+     *
      * @return bool
      */
     public function authorize(): bool
@@ -39,6 +41,8 @@ class CurrencyRequest extends Request
     }
 
     /**
+     * Get all data from the request.
+     *
      * @return array
      */
     public function getAll(): array
@@ -53,6 +57,8 @@ class CurrencyRequest extends Request
     }
 
     /**
+     * The rules that the incoming request must be matched against.
+     *
      * @return array
      */
     public function rules(): array