Clarify alignment requirements on ptr parameter to image RW commands

The linked section does not document any meaningful requirements. Better
to remove this confusing statement.

Signed-off-by: Kevin Petit <kevin.petit@arm.com>
Change-Id: Ie9715fa79901b6b6f3d110ed8989a8be9f7133ed

Author: kpet

api/opencl_runtime_layer.asciidoc

@@ -3689,8 +3689,6 @@ endif::cl_khr_mipmap_image[]
     pitch is calculated based on the _row_pitch_ {times} _height_.
   * _ptr_ is the pointer to a buffer in host memory where image data is to be
     read from or to be written to.
-    The alignment requirements for ptr are specified in
-    <<alignment-app-data-types,Alignment of Application Data Types>>.
   * _event_wait_list_ and _num_events_in_wait_list_ specify events that need to
     complete before this particular command can be executed.
     If _event_wait_list_ is `NULL`, then this particular command does not wait