Adding docs for data sources.

website/source/docs/providers/dns/d/dns_a_record_set.html.markdown

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+---
+layout: "dns"
+page_title: "DNS: dns_a_record_set"
+sidebar_current: "docs-dns-datasource-a-record-set"
+description: |-
+  Get DNS A record set.
+---
+
+# dns\_a\_record\_set
+
+Use this data source to get DNS A records of the host.
+
+## Example Usage
+
+```
+data "dns_a_record_set" "google" {
+  host = "google.com"
+}
+
+output "google_addrs" {
+  value = "${join(",", data.dns_a_record_set.google.addrs)}"
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+ * `host` - (required): Host to look up
+
+## Attributes Reference
+
+The following attributes are exported:
+
+ * `id` - Set to `host`.
+
+ * `addrs` - A list of IP addresses. IP addresses are always sorted to avoid constant changing plans.

website/source/docs/providers/dns/d/dns_cname_record_set.html.markdown

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+---
+layout: "dns"
+page_title: "DNS: dns_cname_record_set"
+sidebar_current: "docs-dns-datasource-cname-record-set"
+description: |-
+  Get DNS CNAME record set.
+---
+
+# dns\_cname\_record\_set
+
+Use this data source to get DNS CNAME record set of the host.
+
+## Example Usage
+
+```
+data "dns_cname_record_set" "hashicorp" {
+  host = "www.hashicorp.com"
+}
+
+output "hashi_cname" {
+  value = "${data.dns_cname_record_set.hashi.cname}"
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+ * `host` - (required): Host to look up
+
+## Attributes Reference
+
+The following attributes are exported:
+
+ * `id` - Set to `host`.
+
+ * `cname` - A CNAME record associated with host.

website/source/docs/providers/dns/d/dns_txt_record_set.html.markdown

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+---
+layout: "dns"
+page_title: "DNS: dns_txt_record_set"
+sidebar_current: "docs-dns-datasource-txt-record-set"
+description: |-
+  Get DNS TXT record set.
+---
+
+# dns\_txt\_record\_set
+
+Use this data source to get DNS TXT record set of the host.
+
+## Example Usage
+
+```
+data "dns_txt_record_set" "hashicorp" {
+  host = "www.hashicorp.com"
+}
+
+output "hashi_txt" {
+  value = "${data.dns_txt_record_set.hashi.record}"
+}
+
+output "hashi_txts" {
+  value = "${join(",", data.dns_txt_record_set.hashi.records})"
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+ * `host` - (required): Host to look up
+
+## Attributes Reference
+
+The following attributes are exported:
+
+ * `id` - Set to `host`.
+
+ * `record` - The first TXT record.
+
+ * `records` - A list of TXT records.