fix: var inspect doc link error (#21515)

web/app/components/workflow/variable-inspect/empty.tsx

         <div className='system-xs-regular text-text-tertiary'>{t('workflow.debug.variableInspect.emptyTip')}</div>
         <a
           className='system-xs-regular cursor-pointer text-text-accent'
-          href='https://docs.dify.ai/guides/workflow/debug-and-preview/variable-inspect'
+          href='https://docs.dify.ai/en/guides/workflow/debug-and-preview/variable-inspect'
           target='_blank'
           rel='noopener noreferrer'>
             {t('workflow.debug.variableInspect.emptyLink')}