Update sources/platform/actors/publishing/badge.mdx

Co-authored-by: Michał Olender <[email protected]>

Author: netmilk

sources/platform/actors/publishing/badge.mdx

@@ -48,7 +48,7 @@ The badge indicates the state of the Actor in the Apify Platform as the result o
 
 ![Actor badge OK](./images/actor-badge/ok.svg)
 
-#### Actor Under Maintenance
+#### Actor under maintenance
 
 ![Actor badge under maintenance](./images/actor-badge/under-maintenance.svg)