Doc Fix: Update pim_eligible_role_assignment.html.markdown by removing principal_type as required argument.

[unique-dominik]

This property is not required (anymore). It gets decided automatically.

➜ terraform plan 
╷
│ Error: Value for unconfigurable attribute
│ 
│   with azurerm_pim_eligible_role_assignment.mgmt_group_owner_group,
│   on enterprise-maintainers.tf line 93, in resource "azurerm_pim_eligible_role_assignment" "mgmt_group_owner_group":
│   93:   principal_type     = "Group"
│ 
│ Can't configure a value for "principal_type": its value will be decided automatically based on the result of applying this
│ configuration.

➜ terraform version
Terraform v1.4.2
on linux_amd64
+ provider registry.terraform.io/hashicorp/azuread v2.41.0
+ provider registry.terraform.io/hashicorp/azurerm v3.68.0
+ provider registry.terraform.io/hashicorp/time v0.9.1

Your version of Terraform is out of date! The latest version
is 1.5.7. You can update by downloading from https://www.terraform.io/downloads.html

[mbfrahry]

LGTM! Thanks for this @unique-dominik

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