[TASK] Updated the Exception description for V1/customers/password

Author: lewisvoncken

app/code/Magento/Customer/Model/AccountManagement.php

@@ -526,8 +526,13 @@ public function initiatePasswordReset($email, $template, $websiteId = null)
                 default:
                     throw new InputException(
                         __(
-                            'Invalid value of "%value" provided for the %fieldName field.',
-                            ['value' => $template, 'fieldName' => 'email type']
+                            'Invalid value of "%value" provided for the %fieldName field. Possible values are %template1 or %template2.',
+                            [
+                                'value' => $template,
+                                'fieldName' => 'template',
+                                'template1' => AccountManagement::EMAIL_REMINDER,
+                                'template2' => AccountManagement::EMAIL_RESET
+                            ]
                         )
                     );
             }

app/code/Magento/Customer/Test/Unit/Model/AccountManagementTest.php

@@ -1158,7 +1158,7 @@ public function testInitiatePasswordResetEmailReset()
 
     /**
      * @expectedException \Magento\Framework\Exception\InputException
-     * @expectedExceptionMessage Invalid value of "" provided for the email type field
+     * @expectedExceptionMessage Invalid value of "" provided for the template field. Possible values are email_reminder or email_reset.
      */
     public function testInitiatePasswordResetNoTemplate()
     {