[TEST] fix introduced typo

rest-api-spec/src/main/resources/rest-api-spec/test/cluster.allocation_explain/10_basic.yaml

@@ -10,7 +10,7 @@
       cluster.allocation_explain: {}
 
   - do:
-      indices.create:Ø
+      indices.create:
         index: test
 
   - match: { acknowledged: true }