Improve clarity by changing "but" to "so" in sorted sets documentation (#541)

* Improve clarity by changing "but" to "so" in sorted sets documentation

* Update content/develop/data-types/sorted-sets.md

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Co-authored-by: David Dougherty <david.dougherty@redis.com>

Author: DengYuncheng27

content/develop/data-types/sorted-sets.md

@@ -63,7 +63,7 @@ birth year because actually *they are already sorted*.
 Implementation note: Sorted sets are implemented via a
 dual-ported data structure containing both a skip list and a hash table, so
 every time we add an element Redis performs an O(log(N)) operation. That's
-good, but when we ask for sorted elements Redis does not have to do any work at
+good, so when we ask for sorted elements, Redis does not have to do any work at
 all, it's already sorted. Note that the [`ZRANGE`]({{< relref "/commands/zrange" >}}) order is low to high, while the [`ZREVRANGE`]({{< relref "/commands/zrevrange" >}}) order is high to low:
 
 {{< clients-example ss_tutorial zrange >}}