fix: typo in kroki name (#6745)

server/modules/rendering/html-image-prefetch/definition.yml

@@ -1,6 +1,6 @@
 key: htmlImagePrefetch
 title: Image Prefetch
-description: Prefetch remotely rendered images (korki/plantuml)
+description: Prefetch remotely rendered images (kroki/plantuml)
 author: requarks.io
 icon: mdi-cloud-download-outline
 enabledDefault: false