docs: Update example to match default pluginAdminEnabled = false to remove from diff

[rlanore]

Description

Add new AMG parameter

Motivation and Context

To skip update in-place on every tf apply

How Has This Been Tested?

• I have updated at least one of the examples/* to demonstrate and validate my change(s)
• I have executed pre-commit run -a on my pull request

[bryantbiggs]

can you share more details on this change - why its warranted, what problems/issues it solves, what its demonstrating, ?

[rlanore]

With your example file after the first apply every next terraform apply want to update grafana workspace

 # module.managed_grafana.aws_grafana_workspace.this[0] will be updated in-place
  ~ resource "aws_grafana_workspace" "this" {
      ~ configuration             = jsonencode(
          ~ {
              - plugins         = {
                  - pluginAdminEnabled = false
                }
                # (1 unchanged attribute hidden)
            }
        )
        id                        = "g-xxxxxxxxx"
        name                      = "foo"
        tags                      = {}
        # (13 unchanged attributes hidden)
    }

This PR is to add this new attributes to terraform apply correctly like:

No changes. Your infrastructure matches the configuration.

[github-actions]

I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues. If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.

[antonbabenko]

This PR is included in version 2.1.1 🎉