Fix logo names

Author: jmct

donations/sponsors/digital-ocean.markdown

@@ -1,7 +1,7 @@
 ---
 title: DigitalOcean
-logo: /assets/images/sponsors/digital-ocean/digital-ocean-logo-683.png
-srcset: /assets/images/sponsors/digital-ocean/digital-ocean-200.png 200w, /assets/images/sponsors/digital-ocean/digital-ocean-400.png 400w, /assets/images/sponsors/digital-ocean/digital-ocean-683.png 683w
+logo: /assets/images/sponsors/digital-ocean/DO-logo-683.png
+srcset: /assets/images/sponsors/digital-ocean/DO-200.png 200w, /assets/images/sponsors/digital-ocean/DO-400.png 400w, /assets/images/sponsors/DO/digital-ocean-683.png 683w
 externalUrl: https://www.digitalocean.com
 level: Functor
 ---