Update documentation for `lambda_manager` role
Doc:
- https://fusionauth.io/docs/get-started/core-concepts/roles
This indicates that lambda_manager can only add and edit lambdas, but because we do not ship a lambda_deleter role, this role can also delete lambda functions.
The doc should be update to provide clarity.
Internal:
- https://tracker.bugcrowd.com/fusionauth/submissions/f77eb339-7a7f-4a0e-a6a1-13d7294aa531
Related: https://github.com/FusionAuth/fusionauth-site/pull/3448
Looks like there are a few others that need this change as well.
Perhaps - this issue isn't so much to add new roles - although we may want to do that - at the time that was an intentional decision.
This issue is primarily to review the doc to ensure it matches reality.
This should be covered by this PR: https://github.com/FusionAuth/fusionauth-site/pull/3448 where I audited all the manager roles.