docs(javascript): Add links to captureException and captureMessage API docs

- Added links to captureException API documentation in the Capturing Errors section
- Added links to captureMessage API documentation in the Capturing Messages section
- Improves user experience by providing direct access to API interface details

Closes user feedback about wanting to see the interface rather than just examples

Author: cursoragent

docs/platforms/javascript/common/usage/index.mdx

@@ -25,10 +25,14 @@ While capturing an event, you can also record the breadcrumbs that lead up to th
 
 <PlatformContent includePath="capture-error" />
 
+You can learn more about the <PlatformLink to="/apis/#captureexception">`captureException` API</PlatformLink> in our API documentation.
+
 ## Capturing Messages
 
 Another common operation is to capture a bare message. A message is textual information that should be sent to Sentry. Typically, our SDKs don't automatically capture messages, but you can capture them manually.
 
 Messages show up as issues on your issue stream, with the message as the issue name.
 
 <PlatformContent includePath="capture-message" />
+
+You can learn more about the <PlatformLink to="/apis/#capturemessage">`captureMessage` API</PlatformLink> in our API documentation.