Documentation update

[Logofile]

This change includes the following:

• Adds clarifying information about the scope of features to /editions/features.md
• Adds information about Proto Python being able to generate .pyi files in /getting-started/pythontutorial.md
• Changes wording in /overview.md regarding the components that make up protocol buffers
• Adds information about how java_package and java_alt_api_package options are interpreted to /reference/java/java-proto-names.md
• Adds a new topic, /reference/protobuf/edition-2023-spec.md
• Updates /support/version-support.md to reflect the end of support for 3.21.x in C++

PiperOrigin-RevId: 622020800 Change-Id: Ia9a06a1fadfb6c138ea8828fc1537d42ea7ca604