ROUTE53: Docs should specify FQDN with dot.

[tlimoncelli]

After helping with #1128 I noticed that the examples don't include a "." at the end of FQDNs. I think that lead to the confusion.

Here's a PR with corrected (I hope) examples. Are they more correct?

CC @masterzen

[masterzen]

Indeed, the trailing . seems mandatory.
But I couldn't find anywhere in the AWS Route53 documentation a mention for ALIAS records. The mention that the trailing dot is optional for records that take a domain as target, like CNAME (see https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/ResourceRecordTypes.html).
ALIAS are essentially A records, so I assume that this doesn't match the aforementioned rule :)

So I looked to the R53_ALIAS I have in my dnscontrol setup and indeed, all have a trailing dot. So my bad for this non working sample.

Approving :)