Add link to the users used to SSH into the Cloud EC2s (#2392)

Co-authored-by: Manuel de la Peña <[email protected]>

Author: AndersonQ

e2e/TROUBLESHOOTING.md

@@ -8,7 +8,7 @@ Each test suite's documentation should contain the specifics to run the tests, b
 ### SSH into the Cloud machines
 On CI, we are running the Elastic Stack and all test suites in AWS instances, so whenever a build failed we would need to access those machines and inspect the state of the machine: logs, files, containers... For that, we are enabling SSH access to those ephemeral machines, which will be kept for debugging purpose if and only if the DEVELOPER_MODE environment variable is set at the Jenkinsfile. In the UI of Jenkins, you can enable it using the DEVELOPMENT_MODE input argument, checking it to true (default is false). After the build finishes, the cloud instances won't be destroyed.
 
-To access the machines, you must be allowed to do so first, and for that, please submit a PR adding your Github username in alphabetical order to [this file](../.ci/ansible/github-ssh-keys), keeping a blank line as file ending.
+To access the machines, you must be allowed to do so first, and for that, please submit a PR adding your Github username in alphabetical order to [this file](../.ci/ansible/github-ssh-keys), keeping a blank line as file ending. The user to access each EC2 used on the tests can be found [here](https://github.com/elastic/e2e-testing/blob/main/.ci/.e2e-platforms.yaml).
 
 ### Tests fail because the product could not be configured or run correctly
 This type of failure usually indicates that code for these tests itself needs to be changed. See the sections on how to run the tests locally in the specific test suite.