Update windows_subsystems.rst (#1168)
Update windows_subsystems.rst (#1168)

Fix awkward sentence structure. Change "bash terminal" to "bash shell". Remove "wordiness". Change unix to POSIX (see https://www.oreilly.com/library/view/windows-developer-power/0596527543/ch23s15.html). Prefer not starting a sentence with "And". Fix spelling of "temporarily".
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