Glen Smith c62d4b7b0f Clarify preference docs
This commit clarifies the preference docs regarding the explanation of
how operations are routed by default. In particular, the previous use of
"shard replicas" was confusing as it could imply an operation would only
be routed to replicas by default.

Relates #23794
2017-03-29 12:55:47 -04:00
..
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