MB-48569: Remove spurious warning when readLocalDoc fails

Failing to read a local doc isn't necessarily something to warn about
- the docuemnt may not simply exist yet (for example in the case of
_local/collections/dropped).

Remove the warning here, the caller already gets passed back the full
status and can log or not as applicable.

Change-Id: Id28dd609d5f5ab5cf39162576e491984184fc490
Reviewed-on: http://review.couchbase.org/c/kv_engine/+/165263
Tested-by: Build Bot <build@couchbase.com>
Reviewed-by: Trond Norbye <trond.norbye@couchbase.com>

engines/ep/src/kvstore/magma-kvstore/magma-kvstore.cc

@@ -1963,10 +1963,6 @@ std::pair<Status, std::string> MagmaKVStore::processReadLocalDocResult(
                 status.ErrorCode(),
                 "MagmaKVStore::readLocalDoc " + vbid.to_string() +
                         " key:" + keySlice.ToString() + " " + status.String());
-        logger->warn("MagmaKVStore::readLocalDoc {} key:{} returned status: {}",
-                     vbid,
-                     keySlice.ToString(),
-                     status.String());
     } else {
         if (!found) {
             retStatus = magma::Status(