Order functions

The Order module contains the operations for the sample Order record. Keeping behavior beside the type demonstrates how FsLiveDocs distinguishes same-named F# types and modules while presenting both in one API reference.

create rejects negative subtotals and returns a validated order. total applies a fractional tax rate, and its XML documentation includes a checked transcript.

The create source is tagged for transclusion so the deep-reference guide can display the maintained implementation rather than a copied snippet.