Documentation/locking/lockdep: Update info about states

Commit:

  d92a8cfc ("locking/lockdep: Rework FS_RECLAIM annotation")

removed the 'reclaim_fs' lockdep STATE.

Reflect the change in the documentation.

While we are at it, also clarify the formula to calculate the number of state bits.

Signed-off-by: Juri Lelli <juri.lelli@redhat.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-doc@vger.kernel.org
Link: http://lkml.kernel.org/r/20180213185519.18186-2-juri.lelli@redhat.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>