Fixed non-valid JSON (though ES would accept it)

docs/reference/aggregations/pipeline/bucket-script-aggregation.asciidoc

@@ -20,7 +20,7 @@ A `bucket_script` aggregation looks like this in isolation:
             "my_var1": "the_sum", <1>
             "my_var2": "the_value_count"
         },
-        script: "my_var1 / my_var2"
+        "script": "my_var1 / my_var2"
     }
 }
 --------------------------------------------------

docs/reference/aggregations/pipeline/bucket-selector-aggregation.asciidoc

@@ -25,7 +25,7 @@ A `bucket_selector` aggregation looks like this in isolation:
             "my_var1": "the_sum", <1>
             "my_var2": "the_value_count"
         },
-        script: "my_var1 > my_var2"
+        "script": "my_var1 > my_var2"
     }
 }
 --------------------------------------------------