prefab override clarifications and updates

[alexmontAmazon]

Change summary

Clarified and expanded the prefab override documentation

Submission Checklist:

• Descriptive active voice - Do descriptive sentences have a clear subject and action verb?
• Answer the question at hand - Does the documentation answer a what, why, how, or where type of question?
• Consistency - Does the content consistently follow the Style Guide?
• Help the user - Does the documentation show the user something meaningful?

[forkercat]

I think we should remove line 58 - 62. The info is outdated.

[forkercat]

Should we include only prefab overrides in outliner in this section? We have a section below to enable prefab overrides in inspector.

Suggest changing to:

To enable prefab overrides in Entity Outliner, you must set the ed_enableOutlinerOverrideManagement console variable (CVar) to "true". Although you can set this in the Console Variables Editor, this feature is not currently changeable while the Editor is running. Therefore, it must be set before the Editor starts, via a settings registry file:

{
    "O3DE": {
        "Autoexec": {
            "ConsoleCommands": {
                "ed_enableOutlinerOverrideManagement": true
            }
        }
    }
}

{{< note >}}
It is recommended to add your settings registry file to the <project-path>/user/Registry directory as a user-specific override. Files in the user directory are ignored by git and won't be tracked for changes.
{{< /note >}}

To enable prefab overrides in Inspector, you will also want to enable the ed_enableInspectorOverrideManagement flag so that you can edit overrides in the Inspector. Please see the section [[Prefab overrides in Entity Inspector]] below for more info.

---

I am open to move the ed_enableInspectorOverrideManagement section up here and reorganize the contents in the doc, which I think it makes it clearer for users who want to try out all the override features at once. Let me know if you need my help on this.

[forkercat]

When this doc is out, are the two override flags and DPE flag already enabled by default?

[rainbj]

Approval from Sig-UX-UI. Changes are great. FYI This is not a code review

[forkercat]

lgtm