Drivers: hv: fix missing kernel-doc description for 'size' in request_arr_init()

Drivers: hv: fix missing kernel-doc description for 'size' in request_arr_init()

Add missing kernel-doc entry for the @size parameter in
request_arr_init(), fixing the following documentation warning
reported by the kernel test robot and detected via kernel-doc:

Warning: drivers/hv/channel.c:595 function parameter 'size' not described in 'request_arr_init'

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202503021934.wH1BERla-lkp@intel.com
Signed-off-by: Kriish Sharma <kriish.sharma2006@gmail.com>
Reviewed-by: Easwar Hariharan <easwar.hariharan@linux.microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>