[PATCH v2 0/3] Documentation: adopt new coding style of type-aware kmalloc-family

Update the documentation to reflect new type-aware kmalloc-family as
suggested in commit 2932ba8d9c99 ("slab: Introduce kmalloc_obj() and family")

ptr = kmalloc(sizeof(*ptr), gfp);
 -> ptr = kmalloc_obj(*ptr);
ptr = kmalloc(sizeof(struct some_obj_name), gfp);
 -> ptr = kmalloc_obj(*ptr);
ptr = kzalloc(sizeof(*ptr), gfp);
 -> ptr = kzalloc_obj(*ptr);
ptr = kmalloc_array(count, sizeof(*ptr), gfp);
 -> ptr = kmalloc_objs(*ptr, count);
ptr = kcalloc(count, sizeof(*ptr), gfp);
 -> ptr = kzalloc_objs(*ptr, count);

I have also thought about adding a few cases to checkpatch.pl, but this
will take me more time, and i want to get this series finished.

 [v1] -> [v2]:
put RCU/* in a seperate patch [Patch 2/3]
Remove GFP_KERNEL as suggested by https://lwn.net/Articles/1062856/
deprecated.rst: change the argument gfp to optional [Patch 3/3]

Signed-off-by: Manuel Ebner <[email protected]>