Merged PR 221: Version 3 beta 2 doc changes

## Summary
*Replace this text with an explanation of what the changes are and how you implemented them. Can this impact any other parts of the codebase that we should keep in mind?*

## Test process
*How have you tested this (if applicable)?*

## Checklist
- [Y] PR is linked to a **work item**
- [Y] **acceptance criteria** of linked ticket are met
- [Y ] performed **self-review** of the code
- [N] written **tests** for any new functionality added with this PR
- [Y] updated the **documentation** if this PR changes or adds functionality
- [N] written/updated **design docs** if this PR implements new functionality
- [N] updated the **change log**
- [Y] ran **pre-commit** checks for code style
- [N] attended to any **TO-DOs** left in the code

Related work items: #2068

CHANGELOG.md

@@ -39,7 +39,7 @@ SessionManager.
 
 ### Removed
 - Removed legacy simulation modules: `acl`, `common`, `environment`, `links`, `nodes`, `pol`
-- Removed legacy training modules, they are replaced by the new ARCD GATE dependency
+- Removed legacy training modules
 - Removed tests for legacy code