docs: Fix paths in readme to point to proper files (#11364)

This was noticed here:
#11337 (comment),
when viewed on e.g. npmjs.org the relative links to do not work, so we
should have full URLs only in the readme files.

It would be _nicer_ if we could replace this with a proper full URL at
release time to point to the correct version of the file, but that's
more work and probably not worth it...

Author: mydea

packages/node/README.md

@@ -35,7 +35,7 @@ Sentry.init({
 
 Note that it is necessary to initialize Sentry **before you import any package that may be instrumented by us**.
 
-[More information on how to set up Sentry for Node in v8.](./../../docs/v8-node.md)
+[More information on how to set up Sentry for Node in v8.](https://github.com/getsentry/sentry-javascript/blob/develop/docs/v8-node.md)
 
 ### ESM Support
 

packages/opentelemetry/README.md

@@ -86,7 +86,8 @@ function setupSentry() {
 }
 ```
 
-A full setup example can be found in [node-experimental](./../node-experimental).
+A full setup example can be found in
+[node-experimental](https://github.com/getsentry/sentry-javascript/blob/develop/packages/node-experimental).
 
 ## Links