Update DocC curation for newest symbols

[natecook1000]

Some of the symbol identifiers changed since the last release, and OptionGroup and ArgumentArrayParsingStrategy both received new API.

Checklist

• I've added at least one test that validates that my change is working, if appropriate
• I've followed the code style of the rest of the project
• I've read the Contribution Guidelines
• I've updated the documentation if necessary

[natecook1000]

@swift-ci Please test