Documentation/driver-api: usb/URB: drop doubled word

Drop the doubled word "also".
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-usb@vger.kernel.org
Link: https://lore.kernel.org/r/20200704034502.17199-16-rdunlap@infradead.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/driver-api/usb/URB.rst

@@ -240,7 +240,7 @@ How to do isochronous (ISO) transfers?
 ======================================
 
 Besides the fields present on a bulk transfer, for ISO, you also
-also have to set ``urb->interval`` to say how often to make transfers; it's
+have to set ``urb->interval`` to say how often to make transfers; it's
 often one per frame (which is once every microframe for highspeed devices).
 The actual interval used will be a power of two that's no bigger than what
 you specify. You can use the :c:func:`usb_fill_int_urb` macro to fill