Reference that it's possible to reload secure settings

Author: joegallo

docs/reference/ingest/apis/put-ip-location-database.asciidoc

@@ -9,7 +9,8 @@ Creates or updates an IP geolocation database configuration.
 IMPORTANT: The Maxmind `account_id` shown below requires a license key. Because the license key is sensitive information,
 it is stored as a <<secure-settings,secure setting>> in {es} named `ingest.geoip.downloader.maxmind.license_key`. Only
 one Maxmind license key is currently allowed per {es} cluster. A valid license key must be in the secure settings in order
-to download from Maxmind. The license key setting does not take effect until all nodes are restarted.
+to download from Maxmind. The license key setting does not take effect until all nodes are restarted or a
+<<cluster-nodes-reload-secure-settings, `reload_secure_settings`>> request is executed.
 
 [source,console]
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