Fix 404 link.

Author: wu-sheng

docs/en/changes/changes.md

@@ -57,7 +57,7 @@
 * Support `labelAvg` function in the OAL engine.
 * Added `maxLabelCount` parameter in the `labelCount` function of OAL to limit the number of labels can be counted.
 * Adapt the new Browser API(`/browser/perfData/webVitals`, `/browser/perfData/resources`) protocol.
-* Remove redundant code.
+* Add Circuit Breaking mechanism.
 
 #### UI
 
@@ -90,6 +90,7 @@
 * Add `Get Effective TTL Configurations` API documentation.
 * Add Status APIs docs.
 * Simplified the release process with removing maven central publish relative processes.
+* Add Circuit Breaking mechanism doc.
 
 
 All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/224?closed=1)

docs/en/setup/backend/backend-telemetry.md

@@ -15,7 +15,7 @@ telemetry:
     sslCertChainPath: ${SW_TELEMETRY_PROMETHEUS_SSL_CERT_CHAIN_PATH:""}
 ```
 
-Besides the self observability, this supports [OAP circuit breaking](circuit-breaker.md) functionality.
+Besides the self observability, this supports [OAP circuit breaking](circuit-breaking.md) functionality.
 
 ## Self Observability
 SkyWalking supports exposing telemetry data representing OAP running status through Prometheus endpoint.