update index.md
remove return value of GetApproximateSizes in index.md
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@ -478,7 +478,7 @@ leveldb::Range ranges[2];
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ranges[0] = leveldb::Range("a", "c");
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ranges[1] = leveldb::Range("x", "z");
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uint64_t sizes[2];
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leveldb::Status s = db->GetApproximateSizes(ranges, 2, sizes);
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db->GetApproximateSizes(ranges, 2, sizes);
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```
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The preceding call will set `sizes[0]` to the approximate number of bytes of
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