New: Improve help text for extra file importing

Co-Authored-By: Mark McDowall <markus101@users.noreply.github.com>

frontend/src/Settings/MediaManagement/MediaManagement.js

@@ -186,7 +186,10 @@ class MediaManagement extends Component {
                             <FormInputGroup
                               type={inputTypes.TEXT}
                               name="extraFileExtensions"
-                              helpText="Comma separated list of extra files to import, ie sub,nfo (.nfo will be imported as .nfo-orig)"
+                              helpTexts={[
+                                'Comma separated list of extra files to import (.nfo will be imported as .nfo-orig)',
+                                'Examples: ".sub, .nfo" or "sub,nfo"'
+                              ]}
                               onChange={onInputChange}
                               {...settings.extraFileExtensions}
                             />