DocC keeps changing its link syntax. The latest iteration appears to have trouble dealing with Self-taking or Self-returning methods, so change our API to replace Self with a direct mention of the concrete type. ¯\_(ツ)_/¯

That said, the new compiler also found a large number of mismatching parameter names, and that's really helpful.

Checklist

• I've read the Contribution Guidelines
• My contributions are licensed under the Swift license.
• I've followed the coding style of the rest of the project.
• I've added tests covering all new code paths my change adds to the project (if appropriate).
• I've added benchmarks covering new functionality (if appropriate).
• I've verified that my change does not break any existing tests or introduce unexplained benchmark regressions.
• I've updated the documentation if necessary.