Apply suggestions from code review

Co-authored-by: Raphael Götz <52959657+raphael-goetz@users.noreply.github.com>

Author: raphael-goetz

proto/v1/api.proto

@@ -53,7 +53,7 @@ service Octopus {
 }
 
 enum PersistanceTarget {
-  UNKOWN = 0;
+  UNKNOWN = 0;
   PERMANENT = 1;
   CACHED = 2;
 }