Document composite transforms with no input and/or output
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Description
Update the programming guide's Composite Transforms section:
- When to use PBegin/PDone in Java (no input/output PCollections)
- Similarly for Python: PBegin/None, and update PBegin pydoc string
Discussion: https://lists.apache.org/thread.html/r5cad76ea7b5b8404d159dd14c24964242b1d4b49787d6aa6c162d948%40%3Cdev.beam.apache.org%3E
Imported from Jira [BEAM-10495](https://issues.apache.org/jira/browse/BEAM-10495). Original Jira may contain additional context.
Reported by: udim.
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