Put skel_delete function in the document typical form
Update code according to usb-skeleton.c

Signed-off-by: Philipp Hortmann <redacted>
---
 .../driver-api/usb/writing_usb_driver.rst     | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/Documentation/driver-api/usb/writing_usb_driver.rst b/Documentation/driver-api/usb/writing_usb_driver.rst
index b16e4e76d472..74bb72a2f0ac 100644
--- a/Documentation/driver-api/usb/writing_usb_driver.rst
+++ b/Documentation/driver-api/usb/writing_usb_driver.rst

@@ -263,18 +263,17 @@ handle smoothly is the fact that the USB device may be removed from the
 system at any point in time, even if a program is currently talking to
 it. It needs to be able to shut down any current reads and writes and
 notify the user-space programs that the device is no longer there. The
-following code (function ``skel_delete``) is an example of how to do
-this::
+`skel_delete` function is an example of how to do this::