provider/aws: Update instance documentation

Updates instance documentation.

Fixes: #13514

website/source/docs/providers/aws/d/instance.html.markdown

@@ -69,7 +69,7 @@ interpolation.
   * `device_name` - The physical name of the device.
   * `no_device` - Whether the specified device included in the device mapping was suppressed or not (Boolean).
   * `virtual_name` - The virtual device name.
-* `iam_instance_profile` - The instance profile associated with the Instance. Specified as an ARN.
+* `iam_instance_profile` - The name of the instance profile associated with the Instance.
 * `instance_type` - The type of the Instance.
 * `key_name` - The key name of the Instance.
 * `monitoring` - Whether detailed monitoring is enabled or disabled for the Instance (Boolean).

website/source/docs/providers/aws/r/instance.html.markdown

@@ -76,7 +76,7 @@ instances. See [Shutdown Behavior](https://docs.aws.amazon.com/AWSEC2/latest/Use
   the destination address does not match the instance. Used for NAT or VPNs. Defaults true.
 * `user_data` - (Optional) The user data to provide when launching the instance.
 * `iam_instance_profile` - (Optional) The IAM Instance Profile to
-  launch the instance with.
+  launch the instance with. Specified as the name of the Instance Profile.
 * `ipv6_address_count`- (Optional) A number of IPv6 addresses to associate with the primary network interface. Amazon EC2 chooses the IPv6 addresses from the range of your subnet.
 * `ipv6_addresses` - (Optional) Specify one or more IPv6 addresses from the range of the subnet to associate with the primary network interface
 * `tags` - (Optional) A mapping of tags to assign to the resource.