fix a typo in google maps help text

event-organiser-settings.php

@@ -246,7 +246,7 @@ function add_fields( $tab_id){
 						'name'      => 'eventorganiser_options[google_api_key]',
 						'value'     => eventorganiser_get_option( 'google_api_key' ),
 						'help'      => sprintf(
-							esc_html__( 'To use Google Maps you need to regiser an API key with Google. You can register for a free API key by %sfollowing these instructions%s.', 'eventorganiser' ),
+							esc_html__( 'To use Google Maps you need to register an API key with Google. You can register for a free API key by %sfollowing these instructions%s.', 'eventorganiser' ),
 							'<a target="_blank" href="https://developers.google.com/maps/documentation/javascript/get-api-key">',
 							'</a>'
 						)