Fixed Broken Links in Events Documentation

Resolves issue Broken links in Cloud Event docs #6423
Replaces broken link for CloudEvents Spec

Fixes: #6423

Author: jsminem

docs/events.md

@@ -50,7 +50,7 @@ but the underlying `TaskRun` do.
 
 # Events via `CloudEvents`
 
-When you [configure a sink](install.md#configuring-cloudevents-notifications), Tekton emits
+When you [configure a sink](./additional-configs.md#configuring-cloudevents-notifications), Tekton emits
 events as described in the table below.
 
 Tekton sends cloud events in a parallel routine to allow for retries without blocking the
@@ -75,15 +75,15 @@ Resource      |Event    |Event Type
 `Run`         | `Succeed` | `dev.tekton.event.run.successful.v1`
 `Run`         | `Failed`  | `dev.tekton.event.run.failed.v1`
 
-`CloudEvents` for `Runs` are only sent when enabled in the [configuration](./install.md#configuring-cloudevents-notifications).
+`CloudEvents` for `Runs` are only sent when enabled in the [configuration](./additional-configs.md#configuring-cloudevents-notifications).
 
 **Note**: `CloudEvents` for `Runs` rely on an ephemeral cache to avoid duplicate
 events. In case of controller restart, the cache is reset and duplicate events
 may be sent.
 
 ## Format of `CloudEvents`
 
-According to the [`CloudEvents` spec](https://github.com/cloudevents/spec/blob/master/spec.md), HTTP headers are included to match the context fields. For example:
+According to the [`CloudEvents` spec](https://github.com/cloudevents/spec/blob/main/cloudevents/spec.md), HTTP headers are included to match the context fields. For example:
 
 ```
 "Ce-Id": "77f78ae7-ff6d-4e39-9d05-b9a0b7850527",