New: Description for indexer RSS setting

Fixes #2098

frontend/src/Settings/Indexers/Indexers/EditIndexerModalContent.js

@@ -90,6 +90,7 @@ function EditIndexerModalContent(props) {
                 <FormInputGroup
                   type={inputTypes.CHECK}
                   name="enableRss"
+                  helpText={supportsRss.value ? translate('EnableRssHelpText') : undefined}
                   helpTextWarning={supportsRss.value ? undefined : translate('SupportsRssvalueRSSIsNotSupportedWithThisIndexer')}
                   isDisabled={!supportsRss.value}
                   {...enableRss}

src/NzbDrone.Core/Localization/Core/en.json

@@ -243,6 +243,7 @@
   "EnableInteractiveSearch": "Enable Interactive Search",
   "EnableProfile": "Enable Profile",
   "EnableRSS": "Enable RSS",
+  "EnableRssHelpText": "Will be used when Readarr periodically looks for releases via RSS Sync",
   "EnableSSL": "Enable SSL",
   "EnableSslHelpText": " Requires restart running as administrator to take effect",
   "Ended": "Ended",