Status: calls: template: minor improvements

AsciiDoc, not AsciiDoctor.

Delimit URIs with angle brackets
https://datatracker.ietf.org/doc/html/rfc3986#appendix-C
and then, the white spaces preceding full stops (.) can be properly
removed.

Americanise white space: one space, not two, between sentences.

Approved by: salvadore
Pull request: https://github.com/freebsd/freebsd-doc/pull/138