docs: fixing renderscript doc bug 6111834

<code>rs_program_fragment</code> and <code>rs_allocation</code>, you have to obtain an object of the

corresponding Android framework class first and then call the <code>set</code> method for that

structure to bind the memory to the Renderscript runtime. You cannot directly manipulate these structures

at the Renderscript runtime layer. Keep in mind that user-defined structures

cannot contain pointers, so this restriction only applies to certain structures that are provided by Renderscript. 

at the Renderscript runtime layer. This restriction is not applicable to user-defined structures

that contain pointers, because they cannot be exported to a reflected layer class

in the first place. A compiler error is generated if you try to declare a non-static, global

struct that contains a pointer.

</p>

<p>Renderscript also has support for pointers, but you must explicitly allocate the memory in your