Fixes #6241 Broken Links in "Sender Identity for Knative Eventing" Doc (#6242)

* fix broken links

* added links for Channels section

Author: chaliuu

docs/eventing/features/sender-identity.md

@@ -26,15 +26,15 @@ Knative Eventing Souces request an OIDC access token for the targets audience an
 OIDC authentication is currently supported for the following components:
 
 - Brokers:
-    - [MTChannelBasedBroker](./../brokers/broker-types/channel-based-broker/)
-    - [Knative Broker for Apache Kafka](./../brokers/broker-types/kafka-broker/)
+    - [MTChannelBasedBroker](./../../brokers/broker-types/channel-based-broker/)
+    - [Knative Broker for Apache Kafka](./../../brokers/broker-types/kafka-broker/)
 - Channels:
-    - InMemoryChannel
-    - KafkaChannel
+    - [InMemoryChannel](./../../channels/channels-crds/)
+    - [KafkaChannel](./../../channels/channels-crds/)
 - Sources:
-    - [ApiServerSource](./../sources/apiserversource/)
-    - [PingSource](./../sources/ping-source/)
-    - [KafkaSource](./../sources/kafka-source/)
+    - [ApiServerSource](./../../sources/apiserversource/)
+    - [PingSource](./../../sources/ping-source/)
+    - [KafkaSource](./../../sources/kafka-source/)
 
 ## Sender Identity Configuration