add documentation for overlay annotations #21184
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Adds public-facing documentation for overlay annotations to the QL language reference and specification. These annotations control predicate behavior during overlay evaluation, a feature for incremental analysis used primarily by GitHub Code Scanning for pull request analysis.
Changes
overlay[local],overlay[local?],overlay[global],overlay[caller],overlay[caller?],overlay[discard_entity]) with descriptions, examples, and troubleshooting for common compilation errorsMotivation
When overlay compilation is enabled for a QL pack, developers may encounter compilation errors related to overlay constraints. This documentation helps QL developers understand what the annotations mean and resolve errors in custom libraries.