XSpec Clarity - For Scenario FedRAMP OSCAL SSP FIPS 140 validation - ssp.xspec

Extended Description

As a user, I would like to read clear XSpec textual representations in the web documentation.

See #516 for more general description.

Acceptance Criteria

[ ] All Schematron assertion messages are declarative statements which affirm the positive test outcome.
[ ] All Schematron assertion diagnostic messages are declarative statements which explain the negative test outcome.
[ ] The Schematron code has no assertion failures when validated using src/validations/styleguides/sch.sch using the basic phase.
[ ] XSpec unit tests for positive and negative Schematron assertion outcomes accompany all Schematron assertions (where feasible).
[ ] XSpec descriptions read clearly in the web documentation for the scenario FedRAMP OSCAL SSP FIPS 140 validation

Definition of Done

[ ] Acceptance criteria met
[ ] Unit test coverage of our code > 95%
[ ] Automated code quality checks passed
[ ] Security reviewed and reported
[ ] Reviewed against plain language guidelines
[ ] Code must be self-documenting
[ ] No local tech debt
[ ] Load/performance tests passed – needs to be created/automated
[ ] Documentation updated
[ ] Architectural Decision Record completed as necessary for significant design choices
[ ] PR reviewed & approved
[ ] Source code merged

18F / fedramp-automation