Update docs/monitoring/sharding.md

Co-authored-by: Théo Brigitte <[email protected]>

docs/monitoring/sharding.md

@@ -4,7 +4,7 @@ To be able to ingest metrics without disrupting the workload running in the clus
 
 __By default__, the operator configures 1 shard for every 1M time series present in Mimir for the workload cluster. To avoid scaling down too abruptly, we defined a scale down threshold of 20%.
 
-As this default value was not enough to avoid workload disruptions, we added 2 ways to be able to override the scale up series count target and the scale down percentage.
+Scale up series threshold and scale down percentage are overridables.
 
 1. Those values can be configured at the installation level by overriding the following values: