[Chapel Merge] Add a description of the generic `union` type alongside `record`, `class`

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Branch: refs/heads/main
Revision: 1ef652a9618ef74ff6d8b783bbc6a366ea3ed417
Author: bradcray
Link: Add a description of the generic `union` type alongside `record`, `class` by bradcray · Pull Request #28972 · chapel-lang/chapel · GitHub
Log Message:
Add a description of the generic union type alongside record, class (#28972)

[trivial, not reviewed]

Compare: Comparing f922ed961eff9856744a802c355e0f8b6724e785...cb89ab5a2c639adbbfe14dc8f5cc0e0b70e51c6b · chapel-lang/chapel · GitHub

Diff:
M doc/rst/language/spec/generics.rst
https://github.com/chapel-lang/chapel/pull/28972.diff