docs: add default ttl to digitalocean_record

[unixlab]

figured it out myself and thought it might be helpful in the docs.

[ChiefMateStarbuck]

Hello UnixLab. Thank you for the contribution. Where did you find the answer to this?

[unixlab]

I figured this out by letting it run against the API while setting TF_LOG=trace:

---[ REQUEST ]---------------------------------------
POST /v2/domains/<redacted my domain>/records HTTP/1.1
Host: api.digitalocean.com
User-Agent: Terraform/1.1.5 godo/1.69.1
Content-Length: 89
Accept: application/json
Content-Type: application/json
Accept-Encoding: gzip

{
 "type": "A",
 "name": "test",
 "data": "127.0.0.1",
 "priority": 0,
 "port": 0,
 "weight": 0,
 "flags": 0
}

---[ RESPONSE ]--------------------------------------
HTTP/2.0 201 Created
Content-Length: 155
Cache-Control: max-age=0, private, must-revalidate
Cf-Cache-Status: DYNAMIC
Cf-Ray: <redacted>
Content-Type: application/json; charset=utf-8
Date: Thu, 17 Feb 2022 11:24:36 GMT
Expect-Ct: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
Ratelimit-Limit: 5000
Ratelimit-Remaining: 4976
Ratelimit-Reset: 1645100658
Server: cloudflare
Set-Cookie: <redacted>
X-Gateway: Edge-Gateway
X-Request-Id: <redacted>
X-Response-From: service

{
 "domain_record": {
  "id": 295198840,
  "type": "A",
  "name": "test",
  "data": "127.0.0.1",
  "priority": null,
  "port": null,
  "ttl": 1800,
  "weight": null,
  "flags": null,
  "tag": null
 }
}

To technically the default comes from the API and not the terraform provider code.

[ChiefMateStarbuck]

Awesome. Thank you so much.

[MattIPv4]

Hey, @unixlab - Thanks a ton for this sweet PR! 😄

Would you please shoot me an email when you get a chance?
mcowley at digitalocean dot com 🎉