docs: Fix broken link in Monitor Boundary (#6044)

* docs: Fix broken link in Monitor Boundary

* docs: Fix a typo

Author: Dan-Heath

website/content/docs/monitor/index.mdx

@@ -50,7 +50,7 @@ Refer to the following topics for more information on the various ways to monito
 
 - [Monitor metrics](/boundary/docs/monitor/metrics)
 - [Monitor health](/boundary/docs/monitor/health)
-- [Monitor events](/boundary/docs/monitor/events)
+- [Filter events](/boundary/docs/monitor/events/filter-events)
    - [Common sink parameters](/boundary/docs/monitor/events/common)
    - [File sink](/boundary/docs/monitor/events/file)
-   - [Stderr sink](/boundary//docs/monitor/events/stderr)
+   - [Stderr sink](/boundary/docs/monitor/events/stderr)