docs: Import documentation from source-code inline comments.

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RST format and put in the docs subdirectory.

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+:mod:`sys` --- system specific functions
+========================================
+
+.. module:: sys
+   :synopsis: system specific functions
+
+
+
+Functions
+---------
+
+.. function:: exit([retval])
+
+   Raise a ``SystemExit`` exception.  If an argument is given, it is the
+   value given to ``SystemExit``.
+
+
+Constants
+---------
+
+.. data:: argv
+
+   a mutable list of arguments this program started with
+
+.. data:: byteorder
+
+   the byte order of the system ("little" or "big")
+
+.. data:: path
+
+   a mutable list of directories to search for imported modules
+
+.. data:: platform
+
+   the platform that Micro Python is running on
+
+.. data:: stderr
+
+   standard error (connected to USB VCP, and optional UART object)
+
+.. data:: stdin
+
+   standard input (connected to USB VCP, and optional UART object)
+
+.. data:: stdout
+
+   standard output (connected to USB VCP, and optional UART object)
+
+.. data:: version
+
+   Python language version that this implementation conforms to, as a string
+
+.. data:: version_info
+
+   Python language version that this implementation conforms to, as a tuple of ints