Fix export_modal message (#9353)

Remove duplicate "to", and "others" is plural not possessive.

public/app/features/dashboard/export/export_modal.html

@@ -11,7 +11,7 @@
 	<div>
 		<p class="share-modal-info-text">
 			Export the dashboard to a JSON file. The exporter will templatize the
-			dashboard's data sources to make it easy for other's to to import and reuse.
+			dashboard's data sources to make it easy for others to import and reuse.
 			You can share dashboards on <a class="external-link" href="https://grafana.com">Grafana.com</a>
 		</p>