[PATCH] Fix CTDB statistics hop count calculations

[Martin Schwenke]

We have always assumed that the hop count buckets used in CTDB's
statistics represent powers of 2 hops.  However, the code shifts 2
places to the right... so divides by 4,  Given 16 buckets, the top
bucket contains counts higher than 268435456, which is a little
excessive.

So, divide by 2 instead.

While, the documentation correctly assumed powers of 2, it only had 10
buckets documented, so fix this.

A 2nd patch improves nearby line wrapping in the documentation for lock
buckets.

Please review and maybe push...

peace & happiness,
martin
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