Explanation and example code updates from usb-skeleton

v2: update patch #1 to #4
    - corrected format of function names like the following example:
      "`usb_bulk_msg` function" to "usb_bulk_msg()"

Philipp Hortmann (4):
  Docs: usb: update usb_bulk_msg receiving example
  Docs: usb: update comment and code near decrement our usage count for
    the device
  Docs: usb: update comment and code of function skel_delete
  Docs: usb: update explanation for device_present to disconnected

 .../driver-api/usb/writing_usb_driver.rst     | 73 +++++++++----------
 1 file changed, 35 insertions(+), 38 deletions(-)

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2.25.1