Issue #13237: Make the subprocess convenience helper documentation self-contained aside from the shared parameter description. Downgrade the pipe warnings at that level to notes (since those pipes are hidden, people are unlikely to even try it)

Issue #13237: remove some details that only apply to the 3.x version of this module and cross reference the relocated warning about the dangers of invoking the shell with untrusted input

Patch by Suman Saha.

before all tasks have completed.

Issue #13237: Rearrange subprocess module documentation to emphasise the convenience functions and commonly needed arguments

arguments with the system default encoding just like the write() method
does, instead of converting it to a raw buffer.

exceptions, when a document with timestamp earlier than 1980 is provided to
zipfile. Patch contributed by  Petri Lehtinen.

semicolons. Patch by Ben Darnell and Petri Lehtinen.

Thanks, Shawn Ligocki!

3.x version will come as a separate patch.