Update shuffle-sharding.md (#6730)

Signed-off-by: Charlie Le <[email protected]>

Author: CharlieTLe

docs/guides/shuffle-sharding.md

@@ -16,7 +16,6 @@ The default strategy allows for a fair balance on the resources consumed by each
 However, in a **multi-tenant** cluster, this approach also introduces some **downsides**:
 
 1. An outage affects all tenants
-1.
 2. A misbehaving tenant (eg. causing out-of-memory) could affect all other tenants.
 
 The goal of **shuffle sharding** is to provide an alternative sharding strategy to reduce the blast radius of an outage and better isolate tenants.