docs/data-source/aws_subnet: Minor cleanup

Author: YakDriver

website/docs/d/subnet.html.markdown

@@ -10,15 +10,11 @@ description: |-
 
 `aws_subnet` provides details about a specific VPC subnet.
 
-This resource can prove useful when a module accepts a subnet id as
-an input variable and needs to, for example, determine the id of the
-VPC that the subnet belongs to.
+This resource can prove useful when a module accepts a subnet ID as an input variable and needs to, for example, determine the ID of the VPC that the subnet belongs to.
 
 ## Example Usage
 
-The following example shows how one might accept a subnet id as a variable
-and use this data source to obtain the data necessary to create a security
-group that allows connections from hosts in that subnet.
+The following example shows how one might accept a subnet id as a variable and use this data source to obtain the data necessary to create a security group that allows connections from hosts in that subnet.
 
 ```hcl
 variable "subnet_id" {}
@@ -39,67 +35,53 @@ resource "aws_security_group" "subnet" {
 }
 ```
 
-## Argument Reference
-
-The arguments of this data source act as filters for querying the available
-subnets in the current region. The given filters must match exactly one
-subnet whose data will be exported as attributes.
+### Filter Example
 
-* `availability_zone` - (Optional) The availability zone where the
-  subnet must reside.
-
-* `availability_zone_id` - (Optional) The ID of the Availability Zone for the subnet.
+If you want to match against tag `Name`, use:
 
-* `cidr_block` - (Optional) The cidr block of the desired subnet.
+```hcl
+data "aws_subnet" "selected" {
+  filter {
+    name   = "tag:Name"
+    values = ["yakdriver"]
+  }
+}
+```
 
-* `ipv6_cidr_block` - (Optional) The Ipv6 cidr block of the desired subnet
+## Argument Reference
 
-* `default_for_az` - (Optional) Boolean constraint for whether the desired
-  subnet must be the default subnet for its associated availability zone.
+The arguments of this data source act as filters for querying the available subnets in the current region. The given filters must match exactly one subnet whose data will be exported as attributes.
 
-* `filter` - (Optional) Custom filter block as described below.
+The following arguments are optional:
 
+* `availability_zone` - (Optional) The availability zone where the subnet must reside.
+* `availability_zone_id` - (Optional) The ID of the Availability Zone for the subnet.
+* `cidr_block` - (Optional) The cidr block of the desired subnet.
+* `default_for_az` - (Optional) Boolean constraint for whether the desired subnet must be the default subnet for its associated availability zone.
+* `filter` - (Optional) Configuration block. Detailed below.
 * `id` - (Optional) The id of the specific subnet to retrieve.
-
+* `ipv6_cidr_block` - (Optional) The Ipv6 cidr block of the desired subnet
 * `state` - (Optional) The state that the desired subnet must have.
-
-* `tags` - (Optional) A map of tags, each pair of which must exactly match
-  a pair on the desired subnet.
-
+* `tags` - (Optional) A map of tags, each pair of which must exactly match a pair on the desired subnet.
 * `vpc_id` - (Optional) The id of the VPC that the desired subnet belongs to.
 
-More complex filters can be expressed using one or more `filter` sub-blocks,
-which take the following arguments:
+### filter
 
-* `name` - (Required) The name of the field to filter by, as defined by
-  [the underlying AWS API](http://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DescribeSubnets.html).
-  For example, if matching against tag `Name`, use:
+This block allows for complex filters. You can use one or more `filter` blocks.
 
-```hcl
-data "aws_subnet" "selected" {
-  filter {
-    name   = "tag:Name"
-    values = [""] # insert value here
-  }
-}
-```
+The following arguments are required:
 
-* `values` - (Required) Set of values that are accepted for the given field.
-  A subnet will be selected if any one of the given values matches.
+* `name` - (Required) The name of the field to filter by, as defined by [the underlying AWS API](http://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DescribeSubnets.html).
+* `values` - (Required) Set of values that are accepted for the given field. A subnet will be selected if any one of the given values matches.
 
 ## Attributes Reference
 
-All of the argument attributes except `filter` blocks are also exported as
-result attributes. This data source will complete the data by populating
-any fields that are not included in the configuration with the data for
-the selected subnet.
-
-In addition the following attributes are exported:
+In addition to the attributes above, the following attributes are exported:
 
-* `arn` - The ARN of the subnet.
+* `arn` - ARN of the subnet.
+* `available_ip_address_count` - Available IP addresses of the subnet.
 * `customer_owned_ipv4_pool` - Identifier of customer owned IPv4 address pool.
 * `map_customer_owned_ip_on_launch` - Whether customer owned IP addresses are assigned on network interface creation.
 * `map_public_ip_on_launch` - Whether public IP addresses are assigned on instance launch.
-* `available_ip_address_count` - The available IP addresses of the subnet.
-* `owner_id` - The ID of the AWS account that owns the subnet.
-* `outpost_arn` - The Amazon Resource Name (ARN) of the Outpost.
+* `outpost_arn` - ARN of the Outpost.
+* `owner_id` - ID of the AWS account that owns the subnet.