Fix Circuit Breaker section in JS client docs

Fix opensearch-project#823

_clients/javascript.md

@@ -142,18 +142,22 @@ search().catch(console.log);
 
 ## Circuit Breaker
 
-The `memoryCircuitBreaker` parameter in the [Cluster Settings API]({{site.url}}{{site.baseurl}}/opensearch/rest-api/cluster-settings/) gives you the ability to reject large query responses where the size of the response could crash OpenSearch Dashboards. To set the Circuit Breaker setting, use the `POST _cluster/settings` API operation on your active JS OpenSearch cluster.
+Helper function to check if memory circuit breaker enabled and the response payload is too large to fit into available heap memory.
+
+The `memoryCircuitBreaker` option can be used to prevent errors caused by a response payload being too large to fit into the available heap memory available to the client.
 
 `memoryCircuitBreaker` contains two fields:
 
 - `enabled`: A Boolean used to turn the Circuit Breaker on or off. Defaults to `false`.
 - `maxPercentage`: The threshold that determines whether the Circuit Breaker engages. The input range must be between `[0 ,1]`. Any number that exceeds that range will correct to `1.0`.
 
-The following example turns on the Circuit Breaker and sets the maximum percentage of a query response to 80% of the cluster's storage. You can customize this example for use in the `POST _cluster/settings` request body.
+The following example instantiates a client with the Circuit Breaker enabled and its threshold set to 80% of the available heap size limit:
 
-```json
-memoryCircuitBreaker: {
-     enabled: true,
-     maxPercentage: 0.8
-}
-```
+```javascript
+var client = new Client({
+  memoryCircuitBreaker: {
+    enabled: true,
+    maxPercentage: 0.8,
+  },
+});
+```