[Cassandra Wiki] Trivial Update of "FAQ" by JonathanEllis

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The "FAQ" page has been changed by JonathanEllis.
The comment on this change is: re-do "mutations against a single key are atomic".
http://wiki.apache.org/cassandra/FAQ?action=diff&rev1=75&rev2=76

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  <<Anchor(batch_mutate_atomic)>>
  
  == Are batch_mutate operations atomic? ==
- No.  [[API#batch_mutate|batch_mutate]] is a way to group many operations into a single call in order to save on the cost of network round-trips.  If `batch_mutate` fails in the middle of its list of mutations, no rollback occurs and the mutations that have already been applied stay applied. The client should typically retry the mutation.
+ As a special case, mutations against a single key are atomic, but more generally no. [[API#batch_mutate|batch_mutate]] allows grouping operations on many keys into a single call in order to save on the cost of network round-trips. If `batch_mutate` fails in the middle of its list of mutations, no rollback occurs and the mutations that have already been applied stay applied. The client should typically retry the `batch_mutate` operation.