## 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
Tested affected notebook.
## Checklist
- [X] PR is linked to a **work item**
- [X] **acceptance criteria** of linked ticket are met
- [X] performed **self-review** of the code
- [ ] written **tests** for any new functionality added with this PR
- [ ] updated the **documentation** if this PR changes or adds functionality
- [ ] written/updated **design docs** if this PR implements new functionality
- [ ] updated the **change log**
- [ ] ran **pre-commit** checks for code style
- [ ] attended to any **TO-DOs** left in the code
#3113: Fix incorrect hostname.
Related work items: #3113
- Improve clarity of some code cells (narrowed output)
- Reworded some questionably worded sections
- Updated some of the util functionality that using old action names
- Updated a lot of old names into kebab-case
- General tidy up and consistency changes.
- All agent training demo notebooks now reference UC2.
- Terminal-Processing Notebook now includes a few extra markdown cells for extra context. Additionally yaml snippets have been updated to reflect 4.0.0 schema
- Request-and-Response notebook now includes a few more markdown cells for extra context as well as updated software names
- General notebook cell clean up and tidying.
**How-To-Use-Primaite-Dev-Mode**
- Neatened up titles and general formatting
**Privilege-Escalation-and-Data-Loss-Example**
- Added new text which gives more context to the scenario (smaller UC7 with a focus on simulation demonstration rather than agent training)
- Fixed Broken terminal commands
- general misc tidying (bolding etc)
- New text that explains that this notebook uses UC2
- New text which informs users that sys_logs slow down training a lot
- New code snippet for the .describe_method()
- YAML obs nest dict updated
- `friendly_output_red_action` updated
- `NMNE` section moved into the same timestep that the attack takes place.
- General OBS print is neater and less bloated
- ACL's code snippets assumed that ACL's indexed at 1 (as they did previously). However, this is no longer the case. (Updated config to reflect this)
- Remove un-necessary env.reset(). (We already reset at the start of the notebook - users can just run-run the notebook)
## Summary
Updates to CHANGELOG.md for 4.0.0.
## Test process
Checked that document rendered correctly.
## Checklist
- [X] PR is linked to a **work item**
- [ ] **acceptance criteria** of linked ticket are met
- [X] performed **self-review** of the code
- [ ] written **tests** for any new functionality added with this PR
- [ ] updated the **documentation** if this PR changes or adds functionality
- [ ] written/updated **design docs** if this PR implements new functionality
- [X] updated the **change log**
- [X] ran **pre-commit** checks for code style
- [ ] attended to any **TO-DOs** left in the code
Related work items: #3105
