sysctl: Group proc_handler declarations and document

Make four groups in the sysctl header and document each group with an
example of how to use them.
1. proc_handler : All functions that can be passed to the proc_handler
   pointer in ctl_table
2. proc handler aggregators: Functions to create proc handlers with
   custom converters
3. bi-directional converters: Functions to create read/write custom
   converters. Can be passed to proc handler aggregators
4. uni-directional converters: Functions to create read or write custom
   converters. Can be passed as args to bi-directional converters

Use just one naming convention in the declarations: 'write' becomes
'dir' and 'buffer' becomes 'buf'.

Signed-off-by: Joel Granados <joel.granados@kernel.org>

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