docs: driver-api: iio: fix errors in documentation

Core elements

=============

The Industrial I/O core offers a unified framework for writing drivers for

many different types of embedded sensors. a standard interface to user space

The Industrial I/O core offers both a unified framework for writing drivers for

many different types of embedded sensors and a standard interface to user space

applications manipulating sensors. The implementation can be found under

:file:`drivers/iio/industrialio-*`

----------------------

* struct :c:type:`iio_dev` - industrial I/O device

* :c:func:`iio_device_alloc()` - alocate an :c:type:`iio_dev` from a driver

* :c:func:`iio_device_alloc()` - allocate an :c:type:`iio_dev` from a driver

* :c:func:`iio_device_free()` - free an :c:type:`iio_dev` from a driver

* :c:func:`iio_device_register()` - register a device with the IIO subsystem

* :c:func:`iio_device_unregister()` - unregister a device from the IIO

===========

HW consumer

===========

An IIO device can be directly connected to another device in hardware. in this

An IIO device can be directly connected to another device in hardware. In this

case the buffers between IIO provider and IIO consumer are handled by hardware.

The Industrial I/O HW consumer offers a way to bond these IIO devices without

software buffer for data. The implementation can be found under